body{padding:0; margin:0; background-color:#f7f7f7;}
.nav{position:fixed; bottom:0; width:100%; background-color:#fff; text-align:center; border-top: 1px solid #f5f5f5;}
.grid-demo{padding:0.2rem 0;}
.grid-demo:checked{color: #1E9FFF;}
.bottom{position:fixed; bottom:0; width:100%; background-color:#fff;}
.buy{padding:0.5rem; }
.product-info{background-color:#fff; padding:1rem;}
.product-info h3{font-weight:bold; line-height:2rem; color:#7b7b7b;}
.product-info .tips{line-height:1.2rem; color:#a7a3a3;}
.product-content{ line-height:2rem;}
.p-sm{ padding:1rem; line-height:1.5rem; color:#7b7b7b;}

.layui-form-checkbox{margin-bottom:0.5rem;}