/*百分比相对于父元素wrap*/
.logo {
    width: 18%;
    background: url("../images/Brand-M.png") no-repeat left;
    background-size: 85px;
}
.search{
    width: 42%;
}
.nav-bar {
    width: 40%;
}
.btn{
    display: none;
}
/*登录*/
.login {
    height: 338px;
}

.mi-logo, .form {
    margin-top: 15px;
}

.mi-logo {
    width: 57%;
}

.form {
    width: 43%;
}
/*热门课程*/
.hot-course-box>div{
    width: 50%;
}