*{ margin:0; padding:0; box-sizing: border-box;}
#ul1{ position:relative; margin:100px auto; background:#1b1f2b; overflow:hidden;}
#ul1 li{ list-style:none;}

/* 粉末消散动画 */
@keyframes powderDissolve {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.2) rotate(180deg);
    opacity: 0.5;
  }
  100% {
    transform: scale(0) rotate(360deg);
    opacity: 0;
  }
}

.powder-dissolve {
  animation: powderDissolve 1.2s ease-out forwards;
}

body { text-align: center; background-color: #00CCCC; }
.box0, .box1, .box2, .box3, .box4, .box5 { 
  background-repeat: no-repeat; 
  background-position: center center; 
  background-size: cover; 
  float: left;
}
.box0{ background-image: url(../images/1.png); }
.box1{ background-image: url(../images/2.png); }
.box2{ background-image: url(../images/3.png); }
.box3{ background-image: url(../images/4.png); }
.box4{ background-image: url(../images/5.png); }
.box5{ background-image: url(../images/6.png); }

/* 响应式媒体查询 */
@media screen and (max-width: 768px) {
  #ul1 {
    margin-top: 50px;
  }
}