How to achieve the animation effect of water ripple diffusion in css (pure code)

The content of this article is about how to realize the animation effect of water pattern diffusion in CSS (pure code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

<div class="main clearfix">
   <!--3*70=210 2*50=100 310-->
   <div class="circle">
      <!--<div class="box"></div>-->
      <div class="box-a"></div>
      <div class="box-b"></div>
      <div class="box-c"></div>
      <div class="box-icon icon-a icon-a-1"></div>
   </div>
   <!--hr正常灰色 hr-x出错  hr-r正确-->
   <div class="hr hr-x"></div>

   <div class="circle">
      <!--<div class="box"></div>-->
      <div class="box-a"></div>
      <div class="box-b"></div>
      <div class="box-c"></div>
      <div class="box-icon icon-b icon-b-2"></div>

   </div>
   <div class="hr hr-r"></div>

   <div class="circle">
      <!--<div class="box"></div>-->
      <div class="box-a"></div>
      <div class="box-b"></div>
      <div class="box-c"></div>
      <div class="box-icon icon-c icon-c-3"></div>
   </div>
</div>

css：

.main{
    position: relative;
    height:70px;
    width: 310px;
    margin: 0 auto;
    background-color: #f34147;
}
.circle{
    position: relative;
    float: left;
    height:70px;
    width: 70px;


}
/*线*/
.hr{
    position: relative;
    float: left;
    width: 50px;
    height:70px;
    background: url("../images/hr_1.png") no-repeat center center;
    background-size: auto 18px;

}
.hr-x{
    background: url("../images/hr_2.png") no-repeat center center;
    background-size: auto 18px;
}
.hr-r{
    background: url("../images/hr_3.png") no-repeat center center;
    background-size: auto 18px;
}

/*按钮  大：47 小：39*/
.box-icon{
    position: absolute;
    z-index: 9999;
    top:0;
    right:0;
    left:0;;
    bottom: 0;
    width: 70px;
    height: 70px;
}
/*小 不亮*/
.icon-a{
    background: url("../images/icon_a_3.png") no-repeat center center;
    background-size:39px 39px;
}
.icon-b{
    background: url("../images/icon_b_3.png") no-repeat center center;
    background-size:39px 39px;
}
.icon-c{
    background: url("../images/icon_c_3.png") no-repeat center center;
    background-size:39px 39px;
}
/*小 亮*/
.icon-a-1{
    background: url("../images/icon_a_2.png") no-repeat center center;
    background-size:39px 39px;
}
.icon-b-1{
    background: url("../images/icon_b_2.png") no-repeat center center;
    background-size:39px 39px;
}
.icon-c-1{
    background: url("../images/icon_c_2.png") no-repeat center center;
    background-size:39px 39px;
}


/*大 亮*/
.icon-a-2{
    background: url("../images/icon_a_1.png") no-repeat center center;
    background-size:47px 47px;
}
.icon-b-2{
    background: url("../images/icon_b_1.png") no-repeat center center;
    background-size:47px 47px;
}
.icon-c-2{
    background: url("../images/icon_c_1.png") no-repeat center center;
    background-size:47px 47px;
}


/*动效*/
@keyframes warn {
     0% {
        transform: scale(0.6);
        opacity: 0;
    }
    25% {
        transform: scale(0.6);
        opacity: 0.8;
    }
    /*50% {*/
        /*transform: scale(0.8);*/
        /*opacity: 0.4;*/
    /*}*/
    /*75% {*/
        /*transform: scale(0.9);*/
        /*opacity: 0.3;*/
    /*}*/
    100% {
        transform: scale(1);
        opacity: 0.1;
    }
}
@-webkit-keyframes warn {
    0% {
        -webkit-transform: scale(0);
        opacity: 0;
    }
    25% {
        -webkit-transform: scale(0.6);
        opacity: 0.8;
    }
    /*50% {*/
        /*-webkit-transform: scale(0.1);*/
        /*opacity: 0.3;*/
    /*}*/
    /*75% {*/
        /*-webkit-transform: scale(0.5);*/
        /*opacity: 0.5;*/
    /*}*/
    100% {
        -webkit-transform: scale(1);
        opacity: 0.1;
    }
}
/* 70*70的容器*/
.box{
    position: absolute;
    width: 70px;
    height: 70px;
    border: 6px solid rgba(225,225,225,0.5);
    -webkit-border-radius:70px;
    -moz-border-radius: 70px;
    border-radius: 70px;
    z-index: 1;
    opacity: 0;
    -webkit-animation: warn  4s ease-out infinite;
    -moz-animation: warn  4s ease-out infinite;
    animation: warn  4s ease-out infinite;
}
.box-a{
    position: absolute;
    width: 70px;
    height: 70px;
    border: 6px solid rgba(225,225,225,0.5);
    -webkit-border-radius:70px;
    -moz-border-radius: 70px;
    border-radius: 70px;
    z-index: 1;
    opacity: 0;
    -webkit-animation: warn  4s ease-out infinite;
    -moz-animation: warn  4s ease-out infinite;
    animation: warn  4s ease-out infinite;
    animation-delay:1s;
    -webkit-animation-delay:1s; /* Safari 和 Chrome */


}
.box-b{
    position: absolute;
    width: 70px;
    height: 70px;
    border: 6px solid rgba(225,225,225,0.5);
    -webkit-border-radius:70px;
    -moz-border-radius: 70px;
    border-radius: 70px;
    z-index: 1;
    opacity: 0;
    -webkit-animation: warn  4s ease-out infinite;
    -moz-animation: warn  4s ease-out infinite;
    animation: warn  4s ease-out infinite;
    animation-delay:2s;
    -webkit-animation-delay:2s; /* Safari 和 Chrome */

}
.box-c{
    position: absolute;
    width: 70px;
    height: 70px;
    border: 6px solid rgba(225,225,225,0.5);
    -webkit-border-radius:70px;
    -moz-border-radius: 70px;
    border-radius: 70px;
    z-index: 1;
    opacity: 0;
    -webkit-animation: warn  4s ease-out infinite;
    -moz-animation: warn  4s ease-out infinite;
    animation: warn  4s ease-out infinite;
    animation-delay:3s;
    -webkit-animation-delay:3s; /* Safari 和 Chrome */
    
}

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