html, body{width: 100%; background-color: lightgray;}
body {
    width: 900px;
    background-color: antiquewhite;
    font-family: "Yu Gothic", sans-serif;
    line-height: 1.6;
    margin: 0 auto;
    padding: 1em;
}
a#topLink{
    display: block;
    position: relative;
    margin: 0;
    margin-top: -1em;
    padding: 0.2em 0.6em;
    font-size: 50%;
    background-color: #007bff;
    color: white;
    text-decoration: none;
    border: solid 2px #007bff;
    border-radius: 7px;
    float: right;
}
a#topLink:hover{
    background-color: #0066dd;
    color: white;
}
a#topLink:active{
top: 3px;
}
div#triangle{
display: inline-block;;
border-right: 0.4em solid transparent;
border-bottom: 0.9em solid white;
border-left: 0.4em solid transparent;
margin-right: 0.25em;
}