Grid for all browsers

Best grid ever

body {
  text-align: center;
}

.grid {
  display: inline-block;
}

.grid__item {
  width: 20em;
  display: inline-block;
  vertical-align: top;
  margin: 1em 0.5em;
  text-align: left;
}

@supports (display:flex) {
  .grid {
    display: flex;
    flex-wrap: wrap;
    margin: -1em 0 1em -0.5em;
    justify-content: space-around;
  }

  .grid__item {
    padding: 1em 0 0 0.5em;
    flex: 1 0 20em;
    max-width: 20em;
    width: auto;
    margin: initial;
  }
}

@supports (display:grid) {
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(20em, 1fr));
    grid-gap: 0.5em;
    margin: initial;
  }

  .grid__item {
    padding: initial;
    max-width: none;
  }
}