html,
body,
div,
img,
form,
input,
label,
div,
span,
h3,
li {
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
    overflow: hidden;
}

ul,
li {
    list-style: none;
}


/* 清除浮动 */

.clear::after {
    content: "";
    display: block;
    clear: both;
}

a {
    text-decoration: none;
}