/* 基础重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

table {
    border-collapse: collapse;
    border-spacing: 0;
}

img {
    border: 0;
    vertical-align: top;
}

ol, ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: normal;
}

input, textarea, select, button {
    font-family: inherit;
    font-size: inherit;
}

a {
    text-decoration: none;
    color: inherit;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.clear {
    clear: both;
    height: 0;
    overflow: hidden;
}

/* 常用类 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.sec {
    padding: 60px 0;
}

.bg {
    background: #f5f5f5;
}