/* 预设样式 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

li {
    list-style: none;
}

em, i {
    font-style: normal;
}

a {
    text-decoration: none;
    color: #333;
}

img {
    vertical-align: middle;
}

input {
    border: none;
    outline: none;
    color: #333;
}