html,
body {
    font-family: Helvetica Neue, PingFang SC, Microsoft YaHei, Helvetica, Arial, sans-serif;
    font-weight: normal;
    font-size: 62.5%;
    /*max-width: 1002px;*/
    margin: 0 auto;
    color: #333;
}

p {
    line-height: 4.3rem;
    font-size: 2.3rem;
}

* {
    margin: 0;
    padding: 0;
}
img{
    width: 100%;
}
.w {
    /*width: 720px;*/
    margin: 0 17%;
}

header {
    height: 8rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}





h1,
h2 {
    font-size: 5.2rem;
    line-height: 8rem;
    color: #333;
    margin: 2% auto;
}


h3,
h4 {
    font-size: 3.2rem;
    line-height: 5rem;
    color: #333;
    margin: 1% 0 ;
}
.context{
   margin: 1% 10%;
}