[FEATURE] Better Constant width to height ratio

[xialvjun]

.better-constant-width-to-height-ratio {
  background: #333;
  width: 50%;
}
.better-constant-width-to-height-ratio::before {
  content: ' ';
  display: block;
  padding-top: 100%;
  float: left;
}
.better-constant-width-to-height-ratio::after {
  content: ' ';
  display: block;
  clear: both;
}

No need to worry about padding.

[atomiks]

Very nice. Please make a PR with these changes and I'll merge ASAP!

[xialvjun]

In fact, I'm lazy. 🙏Orz.
Eh, and my English is not that good, en, that's the excuse.

[lock]

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