CSS Utilities

Ionic Framework provides a set of CSS utility classes that can be used on any element in order to modify the text, element placement or adjust the padding and margin.

注記

If your app was not started using an available Ionic Framework starter, the stylesheets listed in the optional section of the global stylesheets will need to be included in order for these styles to work.

Text Modification

Text Alignment

<ion-grid>
  <ion-row>
    <ion-col>
      <div class="ion-text-start">
        <h3>text-start</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
    <ion-col>
      <div class="ion-text-end">
        <h3>text-end</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
    <ion-col>
      <div class="ion-text-center">
        <h3>text-center</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
  </ion-row>
  <ion-row>
    <ion-col>
      <div class="ion-text-justify">
        <h3>text-justify</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
    <ion-col>
      <div class="ion-text-wrap">
        <h3>text-wrap</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
    <ion-col>
      <div class="ion-text-nowrap">
        <h3>text-nowrap</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit.
      </div>
    </ion-col>
  </ion-row>
</ion-grid>

Class	Style Rule	Description
.ion-text-left	text-align: left	The inline contents are aligned to the left edge of the line box.
.ion-text-right	text-align: right	The inline contents are aligned to the right edge of the line box.
.ion-text-start	text-align: start	The same as text-left if direction is left-to-right and text-right if direction is right-to-left.
.ion-text-end	text-align: end	The same as text-right if direction is left-to-right and text-left if direction is right-to-left.
.ion-text-center	text-align: center	The inline contents are centered within the line box.
.ion-text-justify	text-align: justify	The inline contents are justified. Text should be spaced to line up its left and right edges to the left and right edges of the line box, except for the last line.
.ion-text-wrap	white-space: normal	Sequences of whitespace are collapsed. Newline characters in the source are handled as other whitespace. Breaks lines as necessary to fill line boxes.
.ion-text-nowrap	white-space: nowrap	Collapses whitespace as for normal, but suppresses line breaks (text wrapping) within text.

Text Transformation

<ion-grid>
  <ion-row>
    <ion-col>
      <div class="ion-text-uppercase">
        <h3>text-uppercase</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
    <ion-col>
      <div class="ion-text-lowercase">
        <h3>text-lowercase</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
    <ion-col>
      <div class="ion-text-capitalize">
        <h3>text-capitalize</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
  </ion-row>
</ion-grid>

Class	Style Rule	Description
.ion-text-uppercase	text-transform: uppercase	Forces all characters to be converted to uppercase.
.ion-text-lowercase	text-transform: lowercase	Forces all characters to be converted to lowercase.
.ion-text-capitalize	text-transform: capitalize	Forces the first letter of each word to be converted to uppercase.

Responsive Text Classes

All of the text classes listed above have additional classes to modify the text based on the screen size. Instead of text- in each class, use text-{breakpoint}- to only use the class on specific screen sizes, where {breakpoint} is one of the breakpoint names listed in Ionic Breakpoints.

The table below shows the default behavior, where {modifier} is any of the following: left, right, start, end, center, justify, wrap, nowrap, uppercase, lowercase, or capitalize, as they are described above.

Class	Description
.ion-text-{modifier}	Applies the modifier to the element on all screen sizes.
.ion-text-sm-{modifier}	Applies the modifier to the element when min-width: 576px.
.ion-text-md-{modifier}	Applies the modifier to the element when min-width: 768px.
.ion-text-lg-{modifier}	Applies the modifier to the element when min-width: 992px.
.ion-text-xl-{modifier}	Applies the modifier to the element when min-width: 1200px.

Element Placement

Float Elements

The float CSS property specifies that an element should be placed along the left or right side of its container, where text and inline elements will wrap around it. This way, the element is taken from the normal flow of the web page, though still remaining a part of the flow, contrary to absolute positioning.

<ion-grid>
  <ion-row>
    <ion-col class="ion-float-left">
      <div>
        <h3>float-left</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
    <ion-col class="ion-float-right">
      <div>
        <h3>float-right</h3>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ac vehicula lorem.
      </div>
    </ion-col>
  </ion-row>
</ion-grid>

Class	Style Rule	Description
.ion-float-left	float: left	The element will float on the left side of its containing block.
.ion-float-right	float: right	The element will float on the right side of its containing block.
.ion-float-start	float: left / float: right	The same as float-left if direction is left-to-right and float-right if direction is right-to-left.
.ion-float-end	float: left / float: right	The same as float-right if direction is left-to-right and float-left if direction is right-to-left.

Responsive Float Classes

All of the float classes listed above have additional classes to modify the float based on the screen size. Instead of float- in each class, use float-{breakpoint}- to only use the class on specific screen sizes, where {breakpoint} is one of the breakpoint names listed in Ionic Breakpoints.

The table below shows the default behavior, where {modifier} is any of the following: left, right, start, or end, as they are described above.

Class	Description
.ion-float-{modifier}	Applies the modifier to the element on all screen sizes.
.ion-float-sm-{modifier}	Applies the modifier to the element when min-width: 576px.
.ion-float-md-{modifier}	Applies the modifier to the element when min-width: 768px.
.ion-float-lg-{modifier}	Applies the modifier to the element when min-width: 992px.
.ion-float-xl-{modifier}	Applies the modifier to the element when min-width: 1200px.

Element Display

The display CSS property determines if an element should be visible or not. The element will still be in the DOM, but not rendered, if it is hidden.

<ion-grid>
  <ion-row>
    <ion-col class="ion-hide">
      <div>
        <h3>hidden</h3>
        You can't see me.
      </div>
    </ion-col>
    <ion-col>
      <div>
        <h3>not-hidden</h3>
        You can see me!
      </div>
    </ion-col>
  </ion-row>
</ion-grid>

Class	Style Rule	Description
.ion-hide	display: none	The element will be hidden.

Responsive Display Attributes

There are also additional classes to modify the visibility based on the screen size. Instead of just .ion-hide for all screen sizes, use .ion-hide-{breakpoint}-{dir} to only use the class on specific screen sizes, where {breakpoint} is one of the breakpoint names listed in Ionic Breakpoints, and {dir} is whether the element should be hidden on all screen sizes above (up) or below (down) the specified breakpoint.

Class	Description
.ion-hide-sm-{dir}	Applies the modifier to the element when min-width: 576px (up) or max-width: 576px (down).
.ion-hide-md-{dir}	Applies the modifier to the element when min-width: 768px (up) or max-width: 768px (down).
.ion-hide-lg-{dir}	Applies the modifier to the element when min-width: 992px (up) or max-width: 992px (down).
.ion-hide-xl-{dir}	Applies the modifier to the element when min-width: 1200px (up) or max-width: 1200px (down).

Content Space

Element Padding

The padding class sets the padding area of an element. The padding area is the space between the content of the element and its border.

The default amount of padding to be applied is 16px and is set by the --ion-padding variable. See the CSS Variables section for more information on how to change these values.

<ion-grid>
  <ion-row>
    <ion-col class="ion-padding">
      <div>padding</div>
    </ion-col>
    <ion-col class="ion-padding-top">
      <div>padding-top</div>
    </ion-col>
    <ion-col class="ion-padding-start">
      <div>padding-start</div>
    </ion-col>
    <ion-col class="ion-padding-end">
      <div>padding-end</div>
    </ion-col>
  </ion-row>
  <ion-row>
    <ion-col class="ion-padding-bottom">
      <div>padding-bottom</div>
    </ion-col>
    <ion-col class="ion-padding-vertical">
      <div>padding-vertical</div>
    </ion-col>
    <ion-col class="ion-padding-horizontal">
      <div>padding-horizontal</div>
    </ion-col>
    <ion-col class="ion-no-padding">
      <div>no-padding</div>
    </ion-col>
  </ion-row>
</ion-grid>

Class	Style Rule	Description
.ion-padding	padding: 16px	Applies padding to all sides.
.ion-padding-top	padding-top: 16px	Applies padding to the top.
.ion-padding-start	padding-start: 16px	Applies padding to the start.
.ion-padding-end	padding-end: 16px	Applies padding to the end.
.ion-padding-bottom	padding-bottom: 16px	Applies padding to the bottom.
.ion-padding-vertical	padding: 16px 0	Applies padding to the top and bottom.
.ion-padding-horizontal	padding: 0 16px	Applies padding to the left and right.
.ion-no-padding	padding: 0	Applies no padding to all sides.

Element Margin

The margin area extends the border area with an empty area used to separate the element from its neighbors.

The default amount of margin to be applied is 16px and is set by the --ion-margin variable. See the CSS Variables section for more information on how to change these values.

<ion-grid>
  <ion-row>
    <ion-col class="ion-margin">
      <div>margin</div>
    </ion-col>
    <ion-col class="ion-margin-top">
      <div>margin-top</div>
    </ion-col>
    <ion-col class="ion-margin-start">
      <div>margin-start</div>
    </ion-col>
    <ion-col class="ion-margin-end">
      <div>margin-end</div>
    </ion-col>
  </ion-row>
  <ion-row>
    <ion-col class="ion-margin-bottom">
      <div>margin-bottom</div>
    </ion-col>
    <ion-col class="ion-margin-vertical">
      <div>margin-vertical</div>
    </ion-col>
    <ion-col class="ion-margin-horizontal">
      <div>margin-horizontal</div>
    </ion-col>
    <ion-col class="ion-no-margin">
      <div>no-margin</div>
    </ion-col>
  </ion-row>
</ion-grid>

Class	Style Rule	Description
.ion-margin	margin: 16px	Applies margin to all sides.
.ion-margin-top	margin-top: 16px	Applies margin to the top.
.ion-margin-start	margin-start: 16px	Applies margin to the left.
.ion-margin-end	margin-end: 16px	Applies margin to the right.
.ion-margin-bottom	margin-bottom: 16px	Applies margin to the bottom.
.ion-margin-vertical	margin: 16px 0	Applies margin to the top and bottom.
.ion-margin-horizontal	margin: 0 16px	Applies margin to the left and right.
.ion-no-margin	margin: 0	Applies no margin to all sides.

Flex Properties

Flex Container Properties

<ion-grid>
  <ion-row class="ion-justify-content-start">
    <ion-col size="3">
      <div>1 of 2</div>
    </ion-col>
    <ion-col size="3">
      <div>2 of 2</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-justify-content-center">
    <ion-col size="3">
      <div>1 of 2</div>
    </ion-col>
    <ion-col size="3">
      <div>2 of 2</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-justify-content-end">
    <ion-col size="3">
      <div>1 of 2</div>
    </ion-col>
    <ion-col size="3">
      <div>2 of 2</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-justify-content-around">
    <ion-col size="3">
      <div>1 of 2</div>
    </ion-col>
    <ion-col size="3">
      <div>2 of 2</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-justify-content-between">
    <ion-col size="3">
      <div>1 of 2</div>
    </ion-col>
    <ion-col size="3">
      <div>2 of 2</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-justify-content-evenly">
    <ion-col size="3">
      <div>1 of 2</div>
    </ion-col>
    <ion-col size="3">
      <div>2 of 2</div>
    </ion-col>
  </ion-row>
</ion-grid>

<ion-grid>
  <ion-row class="ion-align-items-start">
    <ion-col>
      <div>1 of 4</div>
    </ion-col>
    <ion-col>
      <div>2 of 4</div>
    </ion-col>
    <ion-col>
      <div>3 of 4</div>
    </ion-col>
    <ion-col>
      <div>4 of 4 # # #</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-align-items-end">
    <ion-col>
      <div>1 of 4</div>
    </ion-col>
    <ion-col>
      <div>2 of 4</div>
    </ion-col>
    <ion-col>
      <div>3 of 4</div>
    </ion-col>
    <ion-col>
      <div>4 of 4 # # #</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-align-items-center">
    <ion-col>
      <div>1 of 4</div>
    </ion-col>
    <ion-col>
      <div>2 of 4</div>
    </ion-col>
    <ion-col>
      <div>3 of 4</div>
    </ion-col>
    <ion-col>
      <div>4 of 4 # # #</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-align-items-baseline">
    <ion-col>
      <div>1 of 4</div>
    </ion-col>
    <ion-col>
      <div>2 of 4</div>
    </ion-col>
    <ion-col>
      <div>3 of 4</div>
    </ion-col>
    <ion-col>
      <div>4 of 4 # # #</div>
    </ion-col>
  </ion-row>

  <ion-row class="ion-align-items-stretch">
    <ion-col>
      <div>1 of 4</div>
    </ion-col>
    <ion-col>
      <div>2 of 4</div>
    </ion-col>
    <ion-col>
      <div>3 of 4</div>
    </ion-col>
    <ion-col>
      <div>4 of 4 # # #</div>
    </ion-col>
  </ion-row>
</ion-grid>

Class	Style Rule	Description
.ion-justify-content-start	justify-content: flex-start	Items are packed toward the start on the main axis.
.ion-justify-content-end	justify-content: flex-end	Items are packed toward the end on the main axis.
.ion-justify-content-center	justify-content: center	Items are centered along the main axis.
.ion-justify-content-around	justify-content: space-around	Items are evenly distributed on the main axis with equal space around them.
.ion-justify-content-between	justify-content: space-between	Items are evenly distributed on the main axis.
.ion-justify-content-evenly	justify-content: space-evenly	Items are distributed so that the spacing between any two items is equal.
.ion-align-items-start	align-items: flex-start	Items are packed toward the start on the cross axis.
.ion-align-items-end	align-items: flex-end	Items are packed toward the end on the cross axis.
.ion-align-items-center	align-items: center	Items are centered along the cross axis.
.ion-align-items-baseline	align-items: baseline	Items are aligned so that their baselines align.
.ion-align-items-stretch	align-items: stretch	Items are stretched to fill the container.
.ion-nowrap	flex-wrap: nowrap	Items will all be on one line.
.ion-wrap	flex-wrap: wrap	Items will wrap onto multiple lines, from top to bottom.
.ion-wrap-reverse	flex-wrap: wrap-reverse	Items will wrap onto multiple lines, from bottom to top.

Flex Item Properties

<ion-grid>
  <ion-row>
    <ion-col class="ion-align-self-start">
      <div>1 of 4</div>
    </ion-col>
    <ion-col class="ion-align-self-center">
      <div>2 of 4</div>
    </ion-col>
    <ion-col class="ion-align-self-end">
      <div>3 of 4</div>
    </ion-col>
    <ion-col>
      <div>4 of 4 # # #</div>
    </ion-col>
  </ion-row>
</ion-grid>

Class	Style Rule	Description
.ion-align-self-start	align-self: flex-start	Item is packed toward the start on the cross axis.
.ion-align-self-end	align-self: flex-end	Item is packed toward the end on the cross axis.
.ion-align-self-center	align-self: center	Item is centered along the cross axis.
.ion-align-self-baseline	align-self: baseline	Item is aligned so that its baseline aligns with other item baselines.
.ion-align-self-stretch	align-self: stretch	Item is stretched to fill the container.
.ion-align-self-auto	align-self: auto	Item is positioned according to the parent's align-items value.

Border Display

The border display CSS property determines if the border should be visible or not. The property can be applied to the ion-header and the ion-footer.

<ion-header class="ion-no-border">
  <ion-toolbar>
    <ion-title>Header - No Border</ion-title>
  </ion-toolbar>
</ion-header>

<ion-footer class="ion-no-border">
  <ion-toolbar>
    <ion-title>Footer - No Border</ion-title>
  </ion-toolbar>
</ion-footer>

Class	Description
.ion-no-border	The element will have no border.

Ionic Breakpoints

Ionic uses breakpoints in media queries in order to style an application differently based on the screen size. The following breakpoint names are used in the utility classes listed above, where the class will apply when the width is met.

Breakpoint Name	Width
xs	0
sm	576px
md	768px
lg	992px
xl	1200px