body {
    color: #000;
    background: url('https://7.su.bdimg.com/skin/85.jpg?2') left top; /*背景纯黄色加深*/
    font-family: Verdana,Arial,Helvetica,sans-serif;
    font-size: 9pt;
    min-height: 80%;
    line-height: 1.5;
}

#header {
    background: url('https://4.su.bdimg.com/skin/12.jpg?2') right top no-repeat;/*百度首页星空*/
    height: 178px;
}
#blogTitle {
    height: 178px;
    clear: both;
    background: url('https://4.su.bdimg.com/skin/12.jpg?2')  no-repeat;
}

.three_ball{
  width:15px;
  height:15px;
  background:rgba(0,0,0,0);
  border-radius:50%;
  margin:100px auto;
  position:absolute;
  left:25px;
  top:25px;
  animation:three_ball 3s ease-in-out infinite;
}
@keyframes three_ball {
  0% {box-shadow:15px 15px 0 0 #fff, -15px 15px 0 0 #fff, -15px -15px 0 0 #ff0;}
  8% {box-shadow:15px -15px 0 0 #fff, -15px 15px 0 0 #fff, -15px -15px 0 0 #f0f;}
  17% {box-shadow:15px -15px 0 0 #fff, 15px 15px 0 0 #fff, -15px -15px 0 0 #0ff;}
  25% {box-shadow:15px -15px 0 0 #fff, 15px 15px 0 0 #fff, -15px 15px 0 0 #f00;}
  33% {box-shadow:-15px -15px 0 0 #fff, 15px 15px 0 0 #fff, -15px 15px 0 0 #fff;}
  42% {box-shadow:-15px -15px 0 0 #fff, 15px -15px 0 0 #fff, -15px 15px 0 0 #ff0;}
  50% {box-shadow:-15px -15px 0 0 #fff, 15px -15px 0 0 #fff, 15px 15px 0 0 #fff;}
  58% {box-shadow:-15px 15px 0 0 #fff, 15px -15px 0 0 #fff, 15px 15px 0 0 #f00;}
  67% {box-shadow:-15px 15px 0 0 #fff, -15px -15px 0 0 #fff, 15px 15px 0 0 #00f;}
  75% {box-shadow:-15px 15px 0 0 #fff, -15px -15px 0 0 #fff, 15px -15px 0 0 #f0f;}
  83% {box-shadow:15px 15px 0 0 #fff, -15px -15px #fff 0 0, 15px -15px 0 0 #ff0;}
  92% {box-shadow:15px 15px 0 0 #fff, -15px 15px 0 0 #fff, 15px -15px 0 0 #0ff;}
  100% {box-shadow:15px 15px 0 0 #fff, -15px 15px 0 0 #fff, -15px -15px 0 0 #f00;}
}