body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
form,
fieldset,
legend,
input,
textarea,
button,
p,
blockquote,
th,
td {
    margin: 0;
    padding: 0;
}

body {
    text-align: center;
}

li {
    list-style: none;
}

a {
    text-decoration: none;
}

input {
    outline: none;
    border: 0;
    /* 去除ios input 默认样式 */
    -webkit-appearance: none;
}

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