css loading

css 

/*loading*/
      .loader {
        width: 100px;
        height: 101px;
        border: 8px solid;
        border-top-color: hsl(154,100%,31%);
        border-left-color: hsl(216,87%,52%);
        border-bottom-color: hsl(8,66%,50%);
        border-right-color: hsl(42,100%,51%);
        border-radius: 50%;
        transform: rotate(45deg);
        margin: 30px auto;
      }
      p.loading {
        display: inline-block;
        width: 107px;
        height: 107px;
        /* The background is used to specify the border background */
        background: linear-gradient(90deg, hsla(212,67%,36%,0) 0%,
                                               hsla(207,69%,51%,0) 76%,
                                               hsla(0,0%,100%,1) 85%,
                                               hsla(0,0%,100%,1) 100%); /* W3C */
        /* Background origin is the padding box by default.
        Override to make the background cover the border as well. */
        -moz-background-origin: border;
        background-origin: border-box;
        /* A transparent border determines the width */
        border: 6px solid transparent;
        border-radius: 50%;
        box-shadow: inset -999px 0 0 #fff; /* The background color */
        transform: translate(-8px, 55px);
        animation: loading 1s linear infinite;
      }

      @keyframes loading {
          0% { transform: translate(-9px, -25px) rotate(0deg); }
        100% { transform: translate(-9px, -25px) rotate(360deg); }
      }      

效果如下：

 更多loading:

https://www.qianduan.net/free-html5-css3-loaders-preloaders/