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Html – CSS negative margins, why overlaping on background not in content

When applying a negative margin to an element why the text 1 over the background of child 2 and behind the text , i thought it will be behind the whole box.

html {
  font-size: 40px;
  font-weight: bold;
}

.child1 {
  color: white;
  background-color: red;
}

.child2 {
  color: black;
  background-color: green;
  margin: -35px 0 0 20px;
}
<body>
  <div>
    <div class="child1">text 1 some text here</div>
    <div class="child2">text 2 other text here</div>
  </div>
</body>
Tags:

2

Answers


  1. 0 
    <!DOCTYPE html>
<html>
<head>
<style>
  html {
    font-size: 40px;
    font-weight: bold;
  }

  .child1 {
    color: white;
    background-color: red;
    position: relative; /* Create stacking context */
    z-index: 2; /* Ensure it is above .child2 */
  }

  .child2 {
    color: black;
    background-color: green;
    margin: -35px 0 0 20px;
    position: relative; /* Ensure it is part of stacking context */
    z-index: 1; /* Ensure it is below .child1 */
  }
</style>
</head>
<body>
  <div>
    <div class="child1">text 1 some text here</div>
    <div class="child2">text 2 other text here</div>
  </div>
</body>
</html>
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  2. 0

    You can simply make the whole .child2 box move over the .child1 elt using css z-index property:

    .child2 {
  ...
  position: relative;
  z-index: 2;
}

    Full example:

    html {
  font-size: 40px;
  font-weight: bold;
}

.child1 {
  color: white;
  background-color: red;
}

.child2 {
  color: black;
  background-color: green;
  margin: -35px 0 0 20px;
  position: relative;
  z-index: 2;
}
    <body>
  <div>
    <div class="child1">text 1 some text here</div>
    <div class="child2">text 2 other text here</div>
  </div>
</body>
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