* {
    margin: 0;
    padding: 0;
}

div {
    box-sizing: border-box;
}

a {
    text-decoration: none;
}

ul,
li,
ul>li {
    list-style: none;
}

.header {
    position: relative;
    width: 100%;
    height: 80px;
    margin: 0 60px;
}

.logo {
    display: block;
    width: 60px;
    height: 60px;
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    margin: auto;

}

.logo img {
    width: 100%;
}

.desc_img {
    width: 1500px;
    height: 644px;
    margin: 0 auto;
}

.desc_img img {
    width: 100%;
}