index.css

* {
     -moz-box-sizing: border-box;
     -o-box-sizing: border-box;
     -webkit-box-sizing: border-box;
     box-sizing: border-box;
}

body {
    width: 100%;
    height: 100%;
    font-family: "Open Sans";
    font-size: 13px;
    text-align: center;
     overflow: hidden;
}


#changelog {
    position: fixed;
    padding: 35px;
    float: right;
    bottom: 10;
    right: 10;
/*    z-index: -1;*/
}

#changelog > p {
    width: 80%;
    margin: auto;
    text-align: center;
    
}

#changelog > ul {
    list-style-type: none;
    text-align: left;
    margin: auto;
    padding-left: 0;
}
#container {
    margin: auto;
    text-align: center;
    position: relative;
    top: 50%;
    transform: translate3d(0,-50%,0);
}
@media only screen and (max-width: 1000px) { 
  #changelog { 
    display: none; 
  } 
}
.button {
    display: block;
    width: 250px;
    padding: 15px 0 15px 0;
    margin: 5px auto;
    cursor: pointer;
    color: white;
    text-decoration: none;
    font-size: 15px;
    font-weight: bold;
}

.button:first-child {
    border-radius: 5px 5px 0 0;
}

.button:last-child {
    border-radius: 0 0 5px 5px;
}

.orange  { background-color: orange; }
.green  { background-color: #7FCA9F; }
.blue   { background-color: #85C1F5; }
.red    { background-color: #E96D63; }
.purple { background-color: #DA70D6; }
.yellow { background-color: #F4BA70; }

.green:hover  { background-color: #6EB98E; }
.blue:hover   { background-color: #74B0E4; }
.red:hover    { background-color: #D85C52; }
.purple:hover { background-color: #C96995; }
.yellow:hover { background-color: #E3A969; }