.header{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid #f5f5f5;
    padding-top: .5rem;
    padding-bottom: .5rem;
    background-color: #fff;
}
.header input{
    width: 65%;
    background: #eee;
    color: gray;
}
.tiao{
    width: 3rem;
    height: 1.8rem;
    background: #ff4c39;
    border-radius: .1rem;
    text-align: center;
    line-height: 1.8rem;
    color: #fff;
}

.content{
    margin-top: 3.2rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}