.clearfix:after {content: ".";display: block;clear: both;visibility: hidden;line-height: 0;height: 0;}
.clearfix {display: inline-block;}
* html .clearfix {height: 1%;}

html{background-color: #474747; }

h1{ font-size: 2em;}
h1{ font-size: 1.75em;}
h1{ font-size: 1.5em;}
h1{ font-size: 1.25em;}
h1{ font-size: 0.87em;}
h1{ font-size: 0.63em;}

.centered{position: absolute;bottom: 0;top: 0;left: 0;right: 0;margin: auto;}

.section{height: 100vh;width: 100%;position: relative;}

.box-signup{height: 220px;width: 100%;max-width: 960px;}