* {
    margin: 0;
    border: 0;
    font-size: 16px;
    box-sizing: border-box;
}
ul {
    list-style: none;
}
a {
    text-decoration: none;
}
html,
body {
    height: 100%;
}
.clearfix::after {
    content: '';
    display: block;
    clear: both;
}
.button{
    width: 250px;
    height: 50px;
    display: inline-block;
    border:2px solid #fff;
    border-radius: 5px;
    color: #fff;
    line-height: 50px;
    font-weight: bold;
}