What is causing the additional space at the bottom?

Why does my centered black border triangle have an extra bottom margin causing a scroll bar to appear?

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  width: 100%;
  background: blue;
}

.canvas {
  border: 10px solid black;
  height: 90vh;
  width: 90%;
  margin: 5vh 5%;
}
<body>
  <div class="canvas">
    Placeholder text
  </div>

</body>

View a screenshot showing the issue with the black border triangle alignment.

Answer №1

The reason for this issue is due to the margin: 5vh 5%; property. To properly center a div, it is recommended to utilize flexbox:

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  width: 100%;
  background: blue;

  /* Implementing Flexbox to Center Div */
  display: flex;
  justify-content: center;
  align-items: center;
}

.canvas {
  border: 10px solid black;
  height: 90vh;
  width: 90%;
}
<body>
  <div class="canvas">
    Sample text
  </div>
</body>

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