*{
    margin:0;
    padding:0;
}
.unselectable {
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}
body, html {
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
body, button, input, select, textarea {
    font-family: PingFang SC, Microsoft YaHei, Arial, sans-serif !important;
}
#main{
    background: #fff;
    box-sizing: border-box;
}
.content{
    margin: auto;
    padding-top: .15rem;
    width: 7.5rem;
}
.content .topCont h4{
    margin:.2rem 0;
    font-size:.7rem;
    font-weight:normal;
    text-align: center;
    color:#47cc9b;
}
.letterList{
    background: #fafafa;
    border-radius: .24rem .24rem 0 0;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    margin-top: -.24rem;
    padding: .14rem .11rem .32rem;
    position: relative;
}
.letterList .letterBox{
    background: #fff;
    border: .02rem solid #fff;
    border-radius: .24rem;
    box-shadow: 0 .04rem .14rem 0 rgba(0, 0, 0, .06);
    font-size: 0;
    height: 1.72rem;
    margin: .18rem auto 0;
    padding-top: .42rem;
    position: relative;
    text-align: center;
    width: 1.64rem;
    cursor:pointer;
}
.letterList .letterBox.active{
    background: #f0fffb;
    border: .02rem solid #47cc9b;
    border-radius: .24rem;
}
.letterList .letterBox .icon{
    background: url(../pages/assets/play.png);
    background-size: cover;
    height: .28rem;
    position: absolute;
    right: .2rem;
    top: .2rem;
    width: .28rem;
}
.letterList .letterBox.active .icon{
    background: url(../pages/assets/play.gif);
}
.letterList .letterBox .uppercase{
    color: #333;
    display: inline-block;
    font-size: .48rem;
    font-weight: 500;
    line-height: .66rem;
}
.letterList .letterBox .lowercase{
    color: #333;
    display: inline-block;
    font-size: .36rem;
    font-weight: 500;
    line-height: .5rem;
}
.letterList .letterBox .pronounce{
    color: #aaa;
    font-size: .28rem;
    font-weight: 400;
    line-height: .4rem;
    margin-top: .08rem;
}
#mask{
    display: none;
    position: fixed;
    top:0;
    left:0;
    width:100%;
    height:100vh;
    background: #fff;
    z-index:999;
}
#bigBox{
    display: none;
    width:300px;
    height:360px;
    position:fixed;
    top:50%;
    left:50%;
    margin-top:-180px;
    margin-left:-150px;
    /* border:1px solid green; */
    /* background-image:url(assets/zi.webp);
    background-position: center center;
    background-size: cover; */
    z-index:999;
}
#bigBox .txt{ 
    width:300px;
    height:300px;
    background: #fff;
    color:#000;
    border:2px solid #999;
    border-radius: 20px;
    text-align: center;
    line-height: 300px;
    font-size:150px;
    cursor: pointer;
}
.btnBox{
    padding-top:50px;
    width:300px;
    height:100px;
    line-height: 100px;
    text-align: center;
    /* border:1px solid blue; */
}
.sound{
    display:inline-block;
    margin-right:50px;
}
.close{
    display: inline-block;
    width:42px;
    height:42px;
    font-size:40px;
    text-align: center;
    line-height: 42px;
    color:#999;
    border:1px solid #999;
    border-radius: 21px 21px;
    cursor: pointer;
    vertical-align: top;
}