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CSS3 Animation & Weather Icons

google fonts

<link href='https://fonts.googleapis.com/css?family=Roboto:100,300,700,400' rel='stylesheet' type='text/css'>
<meta name="viewport" content="width=device-width">

border-radius & multi box-shadow

::before & ::after 伪元素

html { box-sizing: border-box; }
html *,
html *:before,
html *:after { box-sizing: inherit; }

body {
  max- 42em;
  padding: 2em;
  margin: 0 auto;
  color: #161616;
  font-family: 'Roboto', sans-serif;
  text-align: center;
  background-color: currentColor;
}

h1 {
  margin-bottom: 1.375em;
  color: #fff;
  font-weight: 100;
  font-size: 2em;
  text-transform: uppercase;
}
p,
a {
  color: rgba(255,255,255,0.3);
  font-size: small;
}
p { margin: 1.375rem 0; }

.icon {
  position: relative;
  display: inline-block;
   12em;
  height: 10em;
  font-size: 1em; /* control icon size here */
}

.cloud {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
   3.6875em;
  height: 3.6875em;
  margin: -1.84375em;
  background: currentColor;
  border-radius: 50%;
  box-shadow:
    -2.1875em 0.6875em 0 -0.6875em,
    2.0625em 0.9375em 0 -0.9375em,
    0 0 0 0.375em #fff,
    -2.1875em 0.6875em 0 -0.3125em #fff,
    2.0625em 0.9375em 0 -0.5625em #fff;
}
/* colorful */
.sun-shower>.cloud{
  box-shadow: -2.1875em 0.6875em 0 -0.6875em, 2.0625em 0.9375em 0 -0.9375em, 0 0 0 0.375em #c33d3d, -2.1875em 0.6875em 0 -0.3125em #28ab1f, 2.0625em 0.9375em 0 -0.5625em #fff;
}
/* multi box-shadow */
.cloud:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: -0.5em;
  display: block;
   4.5625em;
  height: 1em;
  background: currentColor;
  box-shadow: 0 0.4375em 0 -0.0625em #fff;
}
.cloud:nth-child(2) {
  z-index: 0;
  background: #fff;
  box-shadow:
    -2.1875em 0.6875em 0 -0.6875em #fff,
    2.0625em 0.9375em 0 -0.9375em #fff,
    0 0 0 0.375em #fff,
    -2.1875em 0.6875em 0 -0.3125em #fff,
    2.0625em 0.9375em 0 -0.5625em #fff;
  opacity: 0.3;
  transform: scale(0.5) translate(6em, -3em);
  animation: cloud 4s linear infinite;
}
.cloud:nth-child(2):after { background: #fff; }

.sun {
  position: absolute;
  top: 50%;
  left: 50%;
   2.5em;
  height: 2.5em;
  margin: -1.25em;
  background: currentColor;
  border-radius: 50%;
  box-shadow: 0 0 0 0.375em #fff;
  animation: spin 12s infinite linear;
}
.rays {
  position: absolute;
  top: -2em;
  left: 50%;
  display: block;
   0.375em;
  height: 1.125em;
  margin-left: -0.1875em;
  background: #fff;
  border-radius: 0.25em;
  box-shadow: 0 5.375em #fff;
}
.rays:before,
.rays:after {
  content: '';
  position: absolute;
  top: 0em;
  left: 0em;
  display: block;
   0.375em;
  height: 1.125em;
  transform: rotate(60deg);
  transform-origin: 50% 3.25em;
  background: #fff;
  border-radius: 0.25em;
  box-shadow: 0 5.375em #fff;
}
.rays:before {
  transform: rotate(120deg);
}
.cloud + .sun {
  margin: -2em 1em;
}

.rain,
.lightning,
.snow {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
   3.75em;
  height: 3.75em;
  margin: 0.375em 0 0 -2em;
  background: currentColor;
}

.rain:after {
  content: '';
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
   1.125em;
  height: 1.125em;
  margin: -1em 0 0 -0.25em;
  background: #0cf;
  border-radius: 100% 0 60% 50% / 60% 0 100% 50%;
  box-shadow:
    0.625em 0.875em 0 -0.125em rgba(255,255,255,0.2),
    -0.875em 1.125em 0 -0.125em rgba(255,255,255,0.2),
    -1.375em -0.125em 0 rgba(255,255,255,0.2);
  transform: rotate(-28deg);
  animation: rain 3s linear infinite;
}

.bolt {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -0.25em 0 0 -0.125em;
  color: #fff;
  opacity: 0.3;
  animation: lightning 2s linear infinite;
}
.bolt:nth-child(2) {
   0.5em;
  height: 0.25em;
  margin: -1.75em 0 0 -1.875em;
  transform: translate(2.5em, 2.25em);
  opacity: 0.2;
  animation: lightning 1.5s linear infinite;
}
.bolt:before,
.bolt:after {
  content: '';
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
  margin: -1.625em 0 0 -1.0125em;
  border-top: 1.25em solid transparent;
  border-right: 0.75em solid;
  border-bottom: 0.75em solid;
  border-left: 0.5em solid transparent;
  transform: skewX(-10deg);
}
.bolt:after {
  margin: -0.25em 0 0 -0.25em;
  border-top: 0.75em solid;
  border-right: 0.5em solid transparent;
  border-bottom: 1.25em solid transparent;
  border-left: 0.75em solid;
  transform: skewX(-10deg);
}
.bolt:nth-child(2):before {
  margin: -0.75em 0 0 -0.5em;
  border-top: 0.625em solid transparent;
  border-right: 0.375em solid;
  border-bottom: 0.375em solid;
  border-left: 0.25em solid transparent;
}
.bolt:nth-child(2):after {
  margin: -0.125em 0 0 -0.125em;
  border-top: 0.375em solid;
  border-right: 0.25em solid transparent;
  border-bottom: 0.625em solid transparent;
  border-left: 0.375em solid;
}

.flake:before,
.flake:after {
  content: '2744';
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -1.025em 0 0 -1.0125em;
  color: #fff;
  list-height: 1em;
  opacity: 0.2;
  animation: spin 8s linear infinite reverse;
}
.flake:after {
  margin: 0.125em 0 0 -1em;
  font-size: 1.5em;
  opacity: 0.4;
  animation: spin 14s linear infinite;
}
.flake:nth-child(2):before {
  margin: -0.5em 0 0 0.25em;
  font-size: 1.25em;
  opacity: 0.2;
  animation: spin 10s linear infinite;
}
.flake:nth-child(2):after {
  margin: 0.375em 0 0 0.125em;
  font-size: 2em;
  opacity: 0.4;
  animation: spin 16s linear infinite reverse;
}


/* Animations */ 

@keyframes spin {
  100% { transform: rotate(360deg); }
}

@keyframes cloud {
  0% { opacity: 0; }
  50% { opacity: 0.3; }
  100% {
    opacity: 0;
    transform: scale(0.5) translate(-200%, -3em);
  }
}

@keyframes rain {
  0% {
    background: #0cf;
    box-shadow:
      0.625em 0.875em 0 -0.125em rgba(255,255,255,0.2),
      -0.875em 1.125em 0 -0.125em rgba(255,255,255,0.2),
      -1.375em -0.125em 0 #0cf;
  }
  25% {
    box-shadow:
      0.625em 0.875em 0 -0.125em rgba(255,255,255,0.2),
      -0.875em 1.125em 0 -0.125em #0cf,
      -1.375em -0.125em 0 rgba(255,255,255,0.2);
  }
  50% {
    background: rgba(255,255,255,0.3);
    box-shadow:
      0.625em 0.875em 0 -0.125em #0cf,
      -0.875em 1.125em 0 -0.125em rgba(255,255,255,0.2),
      -1.375em -0.125em 0 rgba(255,255,255,0.2);
  }
  100% {
    box-shadow:
      0.625em 0.875em 0 -0.125em rgba(255,255,255,0.2),
      -0.875em 1.125em 0 -0.125em rgba(255,255,255,0.2),
      -1.375em -0.125em 0 #0cf;
  }
}

@keyframes lightning {
  45% {
    color: #fff;
    background: #fff;
    opacity: 0.2;
  }
  50% {
    color: #0cf;
    background: #0cf;
    opacity: 1;
  }
  55% {
    color: #fff;
    background: #fff;
    opacity: 0.2;
  }
}

Google Fonts API

https://developers.google.com/fonts/docs/getting_started

refs

https://codepen.io/xgqfrms/pen/QWNMvEJ

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