$ppr: 750px/16/1rem; // pixel per rem
* {
  margin: 0;
  padding: 0;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-text-size-adjust: none;
  -webkit-tap-highlight-color: transparent;
}

input:-webkit-autofill {
  -webkit-box-shadow: 0 0 0px 1000px white inset;
}

body {
  width: 16rem;
  max-width: 16rem;
  margin: 0 auto;
  font-family: Helvetica,PingFangSC-Regular,"Droid Sans",Arial,sans-serif;
  font-size: 0.34133rem;
  line-height: 1;
  color: #232326;
  overflow-x: hidden;
}

.p:before, .p:after {
  content: "";
  clear: both;
  display: block;
  font-size: 0;
  height: 0;
}

ul, li {
  list-style: none;
}

em {
  font-style: normal;
}

a {
  text-decoration: none;
  color: #666666;
}

.fl {
  float: left;
}

.fr {
  float: right;
}

.but_ad {
  cursor: pointer;
  display: block;
  padding: 0.08533rem 1.06667rem;
  line-height: 1.024rem;
  background: #1B9AF7;
  border-color: #1B9AF7;
  color: white;
  font-size: 0.64rem;
  text-align: center;
  border-radius: 0.08533rem;
  -webkit-box-shadow: 0 0.14933rem 0 #0880d7, 0 0.17067rem 0.064rem rgba(0, 0, 0, 0.3);
  box-shadow: 0 0.14933rem 0 #0880d7, 0 0.17067rem 0.064rem rgba(0, 0, 0, 0.3);
}

.but_ad:active {
  -webkit-box-shadow: 0 0.04267rem 0 #0662a6, 0 0.064rem 0.064rem rgba(0, 0, 0, 0.2);
  box-shadow: 0 0.04267rem 0 #0662a6, 0 0.064rem 0.064rem rgba(0, 0, 0, 0.2);
  background-color: #2798eb;
  border-color: #2798eb;
  color: #0880d7;
}
.abacus{
    background: url(../images/background-picture0.png) no-repeat;
    width: 750px/$ppr;
    height: 1334px/$ppr;
    display: inline-block;
    background-size: cover;
}
.abacus2{
    background: url(../images/background-picture.png) no-repeat;
    background-size: cover;
}
.buttonbox{
    position: absolute;
    left: 50%;
    margin-top: 606px/$ppr;
    margin-left: -463px/2/$ppr;
    a{
        display: block;
        width: 463px/$ppr;
        height: 126px/$ppr;
        font-size: 60px/$ppr;
        color: white;
        text-align: center;
        line-height: 126px/$ppr;
        i{
            background-size: cover;
            display: inline-block;
            vertical-align: middle;
            margin-right: 30px/$ppr;
        }
    }
    .but1{
        background: url(../images/button2x.png) no-repeat;
        background-size: cover;
        i{
            background: url(../images/icon12x.png) no-repeat;
            width: 62px/$ppr;
            height: 63px/$ppr;
        }
    }
    .but2{
        background: url(../images/button22x.png) no-repeat;
        background-size: cover;
        margin-top: 150px/$ppr;
        i{
            background: url(../images/icon22x.png) no-repeat;
            width: 57px/$ppr;
            height: 43px/$ppr;
        }
    }
}