The shape-margin CSS property sets a margin for a CSS shape created using shape-outside.

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The margin lets you adjust the distance between the edges of the shape (the float element) and the surrounding content.


/* <length> values */
shape-margin: 10px;
shape-margin: 20mm;

/* <percentage> value */
shape-margin: 60%;

/* Global values */
shape-margin: inherit;
shape-margin: initial;
shape-margin: revert;
shape-margin: revert-layer;
shape-margin: unset;



Sets the margin of the shape to a <length> value or to a <percentage> of the width of the element's containing block.

Formal definition

Initial value0
Applies tofloats
Percentagesrefer to the width of the containing block
Computed valueas specified, but with relative lengths converted into absolute lengths
Animation typea length, percentage or calc();

Formal syntax

shape-margin = 
<length-percentage [0,∞]>

<length-percentage> =
<length> |


Adding a margin to a polygon


  <div class="shape"></div>
  We are not quite sure of any one thing in biology; our knowledge of geology is
  relatively very slight, and the economic laws of society are uncertain to
  every one except some individual who attempts to set them forth; but before
  the world was fashioned the square on the hypotenuse was equal to the sum of
  the squares on the other two sides of a right triangle, and it will be so
  after this world is dead; and the inhabitant of Mars, if one exists, probably
  knows its truth as we know it.


section {
  max-width: 400px;

.shape {
  float: left;
  width: 150px;
  height: 150px;
  background-color: maroon;
  clip-path: polygon(0 0, 150px 150px, 0 150px);
  shape-outside: polygon(0 0, 150px 150px, 0 150px);
  shape-margin: 20px;



CSS Shapes Module Level 1
# shape-margin-property

Browser compatibility

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See also