Which of these following are the bootstrap 4 positions

 class="position-static">...

Fixed top

Position an element at the top of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add aditional CSS.

 class="fixed-top">...

Fixed bottom

Position an element at the bottom of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add aditional CSS.

 class="fixed-bottom">...

Sticky top

Position an element at the top of the viewport, from edge to edge, but only after you scroll past it. The .sticky-top utility uses CSS’s position: sticky, which isn’t fully supported in all browsers.

IE11 and IE10 will render position: sticky as position: relative. As such, we wrap the styles in a @supports query, limiting the stickiness to only browsers that can render it properly.

 class="sticky-top">...

Position values

Quick positioning classes are available, though they are not responsive.

<div class="position-static">...div>
<div class="position-relative">...div>
<div class="position-absolute">...div>
<div class="position-fixed">...div>
<div class="position-sticky">...div>

Arrange elements

Arrange elements easily with the edge positioning utilities. The format is {property}-{position}.

Where property is one of:

• top - for the vertical top position
• start - for the horizontal left position (in LTR)
• bottom - for the vertical bottom position
• end - for the horizontal right position (in LTR)

Where position is one of:

• 0 - for 0 edge position
• 50 - for 50% edge position
• 100 - for 100% edge position

(You can add more position values by adding entries to the $position-values Sass map variable.)

<div class="position-relative">
  <div class="position-absolute top-0 start-0">div>
  <div class="position-absolute top-0 end-0">div>
  <div class="position-absolute top-50 start-50">div>
  <div class="position-absolute bottom-50 end-50">div>
  <div class="position-absolute bottom-0 start-0">div>
  <div class="position-absolute bottom-0 end-0">div>
div>

Center elements

In addition, you can also center the elements with the transform utility class .translate-middle.

This class applies the transformations translateX(-50%) and translateY(-50%) to the element which, in combination with the edge positioning utilities, allows you to absolute center an element.

<div class="position-relative">
  <div class="position-absolute top-0 start-0 translate-middle">div>
  <div class="position-absolute top-0 start-50 translate-middle">div>
  <div class="position-absolute top-0 start-100 translate-middle">div>
  <div class="position-absolute top-50 start-0 translate-middle">div>
  <div class="position-absolute top-50 start-50 translate-middle">div>
  <div class="position-absolute top-50 start-100 translate-middle">div>
  <div class="position-absolute top-100 start-0 translate-middle">div>
  <div class="position-absolute top-100 start-50 translate-middle">div>
  <div class="position-absolute top-100 start-100 translate-middle">div>
div>

By adding .translate-middle-x or .translate-middle-y classes, elements can be positioned only in horizontal or vertical direction.

<div class="position-relative">
  <div class="position-absolute top-0 start-0">div>
  <div class="position-absolute top-0 start-50 translate-middle-x">div>
  <div class="position-absolute top-0 end-0">div>
  <div class="position-absolute top-50 start-0 translate-middle-y">div>
  <div class="position-absolute top-50 start-50 translate-middle">div>
  <div class="position-absolute top-50 end-0 translate-middle-y">div>
  <div class="position-absolute bottom-0 start-0">div>
  <div class="position-absolute bottom-0 start-50 translate-middle-x">div>
  <div class="position-absolute bottom-0 end-0">div>
div>

Examples

Here are some real life examples of these classes:

<button type="button" class="btn btn-primary position-relative">
  Mails <span class="position-absolute top-0 start-100 translate-middle badge rounded-pill bg-secondary">+99 <span class="visually-hidden">unread messagesspan>span>
button>

<button type="button" class="btn btn-dark position-relative">
  Marker <svg width="1em" height="1em" viewBox="0 0 16 16" class="position-absolute top-100 start-50 translate-middle mt-1 bi bi-caret-down-fill" fill="#212529" xmlns="http://www.w3.org/2000/svg"><path d="M7.247 11.14L2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z"/>svg>
button>

<button type="button" class="btn btn-primary position-relative">
  Alerts <span class="position-absolute top-0 start-100 translate-middle badge border border-light rounded-circle bg-danger p-2"><span class="visually-hidden">unread messagesspan>span>
button>

You can use these classes with existing components to create new ones. Remember that you can extend its functionality by adding entries to the $position-values variable.

<div class="position-relative m-4">
  <div class="progress" style="height: 1px;">
    <div class="progress-bar" role="progressbar" style="width: 50%;" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100">div>
  div>
  <button type="button" class="position-absolute top-0 start-0 translate-middle btn btn-sm btn-primary rounded-pill" style="width: 2rem; height:2rem;">1button>
  <button type="button" class="position-absolute top-0 start-50 translate-middle btn btn-sm btn-primary rounded-pill" style="width: 2rem; height:2rem;">2button>
  <button type="button" class="position-absolute top-0 start-100 translate-middle btn btn-sm btn-secondary rounded-pill" style="width: 2rem; height:2rem;">3button>
div>

Sass

Maps

Default position utility values are declared in a Sass map, then used to generate our utilities.

$position-values: (
  0: 0,
  50: 50%,
  100: 100%
);

Utilities API

Position utilities are declared in our utilities API in scss/_utilities.scss. Learn how to use the utilities API.

    "position": (
      property: position,
      values: static relative absolute fixed sticky
    ),
    "top": (
      property: top,
      values: $position-values
    ),
    "bottom": (
      property: bottom,
      values: $position-values
    ),
    "start": (
      property: left,
      class: start,
      values: $position-values
    ),
    "end": (
      property: right,
      class: end,
      values: $position-values
    ),
    "translate-middle": (
      property: transform,
      class: translate-middle,
      values: (
        null: translate(-50%, -50%),
        x: translateX(-50%),
        y: translateY(-50%),
      )
    ),
    

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