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

html, body {
  height: 100%;
  background: #f8f8f8;
}

body {
  display: grid;
  place-items: center;
}

.loader {
  width: 96px;
  height: 96px;
  position: relative;
  animation: spin 0.9s linear infinite;
}

.loader span {
  position: absolute;
  width: 10px;
  height: 28px;
  background: #555;
  border-radius: 5px;
  left: 50%;
  top: 0;
  margin-left: -5px;
  transform-origin: 50% 48px;
  opacity: 0.15;
}

.loader span:nth-child(1)  { transform: rotate(0deg);   opacity: 1; }
.loader span:nth-child(2)  { transform: rotate(30deg);  opacity: 0.9; }
.loader span:nth-child(3)  { transform: rotate(60deg);  opacity: 0.75; }
.loader span:nth-child(4)  { transform: rotate(90deg);  opacity: 0.6; }
.loader span:nth-child(5)  { transform: rotate(120deg); opacity: 0.45; }
.loader span:nth-child(6)  { transform: rotate(150deg); opacity: 0.35; }
.loader span:nth-child(7)  { transform: rotate(180deg); opacity: 0.25; }
.loader span:nth-child(8)  { transform: rotate(210deg); opacity: 0.2; }
.loader span:nth-child(9)  { transform: rotate(240deg); opacity: 0.15; }
.loader span:nth-child(10) { transform: rotate(270deg); opacity: 0.12; }
.loader span:nth-child(11) { transform: rotate(300deg); opacity: 0.1; }
.loader span:nth-child(12) { transform: rotate(330deg); opacity: 0.08; }

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