等待动画 loading

<style>
.lds-dual-ring {
  display: inline-block;
  width: 64px;
  height: 64px;
}
.lds-dual-ring:after {
  content: " ";
  display: block;
  width: 46px;
  height: 46px;
  margin: 1px;
  border-radius: 50%;
  border: 5px solid #000;
  border-color: #000 transparent #000 transparent;
  animation: lds-dual-ring 1.2s linear infinite;
}
@keyframes lds-dual-ring {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>
<div class="lds-dual-ring"></div>
<style>
.lds-facebook {
  display: inline-block;
  position: relative;
  width: 64px;
  height: 64px;
}
.lds-facebook div {
  display: inline-block;
  position: absolute;
  left: 6px;
  width: 13px;
  background: #000;
  animation: lds-facebook 1.2s cubic-bezier(0, 0.5, 0.5, 1) infinite;
}
.lds-facebook div:nth-child(1) {
  left: 6px;
  animation-delay: -0.24s;
}
.lds-facebook div:nth-child(2) {
  left: 26px;
  animation-delay: -0.12s;
}
.lds-facebook div:nth-child(3) {
  left: 45px;
  animation-delay: 0;
}
@keyframes lds-facebook {
  0% {
    top: 6px;
    height: 51px;
  }
  50%, 100% {
    top: 19px;
    height: 26px;
  }
}
</style>
<div  class="lds-facebook"> <div></div><div></div><div></div> </div>
<style>
.lds-heart {
  display: inline-block;
  position: relative;
  width: 64px;
  height: 64px;
  transform: rotate(45deg);
  transform-origin: 32px 32px;
}
.lds-heart div {
  top: 23px;
  left: 19px;
  position: absolute;
  width: 26px;
  height: 26px;
  background: #000;
  animation: lds-heart 1.2s infinite cubic-bezier(0.215, 0.61, 0.355, 1);
}
.lds-heart div:after,
.lds-heart div:before {
  content: " ";
  position: absolute;
  display: block;
  width: 26px;
  height: 26px;
  background: red;
}
.lds-heart div:before {
  left: -17px;
  border-radius: 50% 0 0 50%;
}
.lds-heart div:after {
  top: -17px;
  border-radius: 50% 50% 0 0;
}
@keyframes lds-heart {
  0% {
    transform: scale(0.95);
  }
  5% {
    transform: scale(1.1);
  }
  39% {
    transform: scale(0.85);
  }
  45% {
    transform: scale(1);
  }
  60% {
    transform: scale(0.95);
  }
  100% {
    transform: scale(0.9);
  }
}
</style>
<div  class="lds-heart"> <div></div></div>
<style>
.lds-roller {
  display: inline-block;
  position: relative;
  width: 64px;
  height: 64px;
}
.lds-roller div {
  animation: lds-roller 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
  transform-origin: 32px 32px;
}
.lds-roller div:after {
  content: " ";
  display: block;
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #000;
  margin: -3px 0 0 -3px;
}
.lds-roller div:nth-child(1) {
  animation-delay: -0.036s;
}
.lds-roller div:nth-child(1):after {
  top: 50px;
  left: 50px;
}
.lds-roller div:nth-child(2) {
  animation-delay: -0.072s;
}
.lds-roller div:nth-child(2):after {
  top: 54px;
  left: 45px;
}
.lds-roller div:nth-child(3) {
  animation-delay: -0.108s;
}
.lds-roller div:nth-child(3):after {
  top: 57px;
  left: 39px;
}
.lds-roller div:nth-child(4) {
  animation-delay: -0.144s;
}
.lds-roller div:nth-child(4):after {
  top: 58px;
  left: 32px;
}
.lds-roller div:nth-child(5) {
  animation-delay: -0.18s;
}
.lds-roller div:nth-child(5):after {
  top: 57px;
  left: 25px;
}
.lds-roller div:nth-child(6) {
  animation-delay: -0.216s;
}
.lds-roller div:nth-child(6):after {
  top: 54px;
  left: 19px;
}
.lds-roller div:nth-child(7) {
  animation-delay: -0.252s;
}
.lds-roller div:nth-child(7):after {
  top: 50px;
  left: 14px;
}
.lds-roller div:nth-child(8) {
  animation-delay: -0.288s;
}
.lds-roller div:nth-child(8):after {
  top: 45px;
  left: 10px;
}
@keyframes lds-roller {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>
<div class="lds-roller"> <div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div> </div>
<style>
.lds-ring {
  display: inline-block;
  position: relative;
  width: 64px;
  height: 64px;
}
.lds-ring div {
  box-sizing: border-box;
  display: block;
  position: absolute;
  width: 51px;
  height: 51px;
  margin: 6px;
  border: 6px solid #000;
  border-radius: 50%;
  animation: lds-ring 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
  border-color: #000 transparent transparent transparent;
}
.lds-ring div:nth-child(1) {
  animation-delay: -0.45s;
}
.lds-ring div:nth-child(2) {
  animation-delay: -0.3s;
}
.lds-ring div:nth-child(3) {
  animation-delay: -0.15s;
}
@keyframes lds-ring {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>
<div class="lds-ring"> <div></div><div></div><div></div><div></div>< /div>
<style>
.lds-ripple {
  display: inline-block;
  position: relative;
  width: 64px;
  height: 64px;
}
.lds-ripple div {
  position: absolute;
  border: 4px solid #000;
  opacity: 1;
  border-radius: 50%;
  animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}
.lds-ripple div:nth-child(2) {
  animation-delay: -0.5s;
}
@keyframes lds-ripple {
  0% {
    top: 28px;
    left: 28px;
    width: 0;
    height: 0;
    opacity: 1;
  }
  100% {
    top: -1px;
    left: -1px;
    width: 58px;
    height: 58px;
    opacity: 0;
  }
}

</style>
<div class="lds-ripple"> <div></div><div></div></div>
<style>
.lds-spinner {
  color: official;
  display: inline-block;
  position: relative;
  width: 64px;
  height: 64px;
}
.lds-spinner div {
  transform-origin: 32px 32px;
  animation: lds-spinner 1.2s linear infinite;
}
.lds-spinner div:after {
  content: " ";
  display: block;
  position: absolute;
  top: 3px;
  left: 29px;
  width: 5px;
  height: 14px;
  border-radius: 20%;
  background: #000;
}
.lds-spinner div:nth-child(1) {
  transform: rotate(0deg);
  animation-delay: -1.1s;
}
.lds-spinner div:nth-child(2) {
  transform: rotate(30deg);
  animation-delay: -1s;
}
.lds-spinner div:nth-child(3) {
  transform: rotate(60deg);
  animation-delay: -0.9s;
}
.lds-spinner div:nth-child(4) {
  transform: rotate(90deg);
  animation-delay: -0.8s;
}
.lds-spinner div:nth-child(5) {
  transform: rotate(120deg);
  animation-delay: -0.7s;
}
.lds-spinner div:nth-child(6) {
  transform: rotate(150deg);
  animation-delay: -0.6s;
}
.lds-spinner div:nth-child(7) {
  transform: rotate(180deg);
  animation-delay: -0.5s;
}
.lds-spinner div:nth-child(8) {
  transform: rotate(210deg);
  animation-delay: -0.4s;
}
.lds-spinner div:nth-child(9) {
  transform: rotate(240deg);
  animation-delay: -0.3s;
}
.lds-spinner div:nth-child(10) {
  transform: rotate(270deg);
  animation-delay: -0.2s;
}
.lds-spinner div:nth-child(11) {
  transform: rotate(300deg);
  animation-delay: -0.1s;
}
.lds-spinner div:nth-child(12) {
  transform: rotate(330deg);
  animation-delay: 0s;
}
@keyframes lds-spinner {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
</style>
<div class="lds-spinner"><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div></div>

https://loading.io/css/