*{
    padding: 0;
    margin: 0;
}

ul,li{
    list-style-type: none;
}
a{
    text-decoration: none;
    color: #000;
}
img{
    width: 100%;
}

.flex{
    display: flex;
}
.y-center{
    align-items: center;
}
html{
    scroll-behavior: smooth;
}

.app{
    min-width: 1200px;
    max-width: 1680px;
    background-color: #fff;
    margin: auto;
    position: relative;
    /*overflow: hidden;*/
}

.header{
    background-color: #fff;
    position: -webkit-sticky; /* 针对Safari浏览器的兼容性 */
    position: sticky;
    top: 0;
    padding: 30px 120px;
    justify-content: space-between;
    box-shadow: 0 6px 6px -6px rgba(0,0,0,.8);
}

.header .menu{
    font-size: 12px;
    width: 500px;
    justify-content: space-around;
}

.header .menu li{
    cursor: pointer;
}
.header .menu li:hover{
    text-decoration: underline;
    opacity: 0.8;
}

.text-link{
    cursor: pointer;
}
.text-link:hover{
    text-decoration: underline;
    opacity: 0.8;
}

.text-button{
    background-color: #000;
    color: #fff;
    padding: 10px 30px;
    border-radius:20px;
    cursor: pointer;
}
.text-button:hover{
    opacity: 0.8;
}

.img-view{
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
}