* {
    box-sizing: border-box;
    /*letter-spacing:1px;*/
    font-family: "Arial", "Microsoft Yahei";
}

body, input, textarea, select, button {
    font-family: "Microsoft Yahei"/"Arial";
}

body, ul, h1, h2, h3, h4, h5, h6, p, ol {
    margin: 0;
    padding: 0;
}

img {
    border: 0;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.parent:after {
    content: "";
    height: 0;
    display: block;
    clear: both;
}

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

ul, ol li {
    padding: 0;
    margin: 0;
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-size: 100%;
}

/*去除火狐浏览器选中文本框后显示红色边框*/
input[required]:invalid,
input:focus:invalid,
textarea[required]:invalid,
textarea:focus:invalid {
    box-shadow: none;
}