Name: Centering - CSS challenges
Rating: 1.9 (5084 reviews)
Author: mitchell_cheng

You can find all the code in this post at the repo Github.

You can check the visual here Vertical Center - CodeSandbox and Horizontal Center.

Centering via CSS

Vertical centering

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Centering</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <p class="center-by-absolute-margin">Centering</p>

    <p class="center-by-pseudo-class">Centering</p>

    <p class="center-by-line-height">Centering</p>

    <p class="center-by-table">Centering</p>

    <div class="center-by-flex">
      <p>Centering</p>
    </div>

    <div class="center-by-grid">
      <p>Centering</p>
    </div>

    <div class="center-by-absolute-parent">
      <p class="center-by-absolute-child">Centering</p>
    </div>

    <p class="center-by-calc">Centering</p>
  </body>
</html>

.center-by-absolute-margin {
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto 0;
}

.center-by-pseudo-class::before {
  content: "";
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}

.center-by-line-height {
  height: 200px;
  line-height: 200;
}

.center-by-table {
  display: table-cell;
  vertical-align: middle;
}

.center-by-flex {
  display: flex;
  align-items: center;
}

.center-by-grid {
  display: grid;
  align-items: center;
}

.center-by-absolute-parent {
  position: relative;
}

.center-by-absolute-child {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

.center-by-calc {
  height: 70px;
  position: relative;
  top: calc(50% - 35px);
}

Horizontal centering

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Centering</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <p class="center-by-fixed-width">Centering</p>

    <p class="center-by-text-align">Centering</p>

    <div class="center-by-unfixed-width">
      <span>Centering</span>
    </div>

    <p class="center-by-table">Centering</p>

    <div class="center-by-flex">
      <p>Centering</p>
    </div>

    <div class="center-by-grid">
      <p>Centering</p>
    </div>

    <div class="center-by-absolute-parent">
      <p class="center-by-absolute-child">Centering</p>
    </div>

    <p class="center-by-calc">Centering</p>
  </body>
</html>

.center-by-fixed-width {
  width: 70px;
  margin: 0 auto;
}

.center-by-text-align {
  text-align: center;
}

.center-by-unfixed-width {
  text-align: center;
}

.center-by-table {
  display: table;
  margin: 0 auto;
}

.center-by-flex {
  display: flex;
  justify-content: center;
}

.center-by-grid {
  display: grid;
  justify-content: center;
}

.center-by-absolute-parent {
  position: relative;
}

.center-by-absolute-child {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.center-by-calc {
  width: 70px;
  margin-left: calc(50% - 35px);
}