style.css

body {
    background-color:#fff;/*#eee;*/
    font-family:"Helvetica Neue",Helvetica Neue,Helvetica,Hiragino Sans GB,Microsoft Yahei,Arial;
}

.marginDown{
    margin-bottom:15px;
}

.jumbotron {
        margin: 40px 0; 
        padding: 40px 0;
        text-align: center;
        background-color:#eee;
}

.randButton {
        margin-bottom: 25px; 
        text-align: center;
}

a:link { text-decoration: none;}

/* Footer */
footer {
  font-size: small;
  color: #666;
  line-height: 2em;
  color: #858585;
  text-align: center;
  margin: 1em 0;
}

footer p {
  margin: 0;
  text-align: center;
}

footer .linkings {
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  /*text-align: left;*/
  width: 100%;
  display: block;
  border: none;
  line-height:100%
}