body{
    width: 1920px; margin: 0 auto;
}
.index{
    padding: 30px 0 0 0;
    height: 58px;
    width: 1920px;
        /* 使用RGBA */
    background-color: #1c1c1c;
    box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.5);
    z-index: 100;
    position: relative;
}
.index span{
    margin: 0 19px;
    position:relative;
    left: 550px;
    color:#ffffff ;

}
/*.index span a{text-decoration: underline;text-underline-offset: 18px; text-decoration-color:#DE636F}*/
.banner {
   position: relative;
    top: -55px;
}
.logo{
    position: relative;
    left: -449px;
    top: -22px;
}
a {text-decoration: none; color: inherit;}