html - CSS property min-height causing margin issue? -

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i trying make div has css-generated triangle attached bottom of it. works when height of div above set using css height property, when use min-height instead, results in there being unwanted gap, unable rid of using margin css properties.

does have idea how rid of issue?

.triangle {    width: 0;    height: 0;    margin-right: auto;    margin-left: auto;    border-style: solid;    border-width: 17px 10.5px 0 10.5px;  }    .divider1 {    min-height: 80px;  }    .divider2 {    height: 80px;  }
<div class="divider1" style="background-color: blue">    <h1>this 1 doesn't work</h1>  </div>  <div class="triangle" style="border-color: blue transparent transparent transparent"></div>    <div class="divider2" style="background-color: green">    <h1>but 1 does?</h1>  </div>  <div class="triangle" style="border-color: green transparent transparent transparent"></div>

it's because h1 element's margin collapsing in second example. known collapsing margins. resolve this, 1 option remove h1 element's margin in first example.

for it's worth, following applies:

box model - 8.3.1 collapsing margins

the bottom margin of in-flow block box height of auto , min-height of 0 collapses last in-flow block-level child's bottom margin if box has no bottom padding , no bottom border , child's bottom margin not collapse top margin has clearance.

a box's own margins collapse if min-height property zero, , has neither top or bottom borders nor top or bottom padding, , has height of either 0 or auto, , not contain line box, , of in-flow children's margins (if any) collapse.

as side note, i'd suggest adding triangle via pseudo-element absolutely positioned relative parent element top value of 100%.

in doing so, work regardless of whether parent has height/min-height, , regardless of element's margin.

.triangle-after {    position: relative;  }  .triangle-after:after {    content: '';    width: 0; height: 0;    position: absolute;    top: 100%;    left: 0; right: 0;    margin: auto;    border-style: solid;    border-width: 17px 10.5px 0 10.5px;  }    .divider1 {    min-height: 80px;  }  .divider1.triangle-after:after {    border-color: blue transparent transparent transparent;  }  .divider2 {    height: 80px;  }  .divider2.triangle-after:after {    border-color: green transparent transparent transparent;  }
<div class="divider1 triangle-after" style="background-color: blue">    <h1>both of these work now.</h1>  </div>    <div class="divider2 triangle-after" style="background-color: green">    <h1>both of these work now.</h1>  </div>


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