body{
    background: #000000;
    color: #fff;
}
.container{
    margin-top:10%;
}
h1{
    font-size: 4em;
}
.output{
    width: 95%;
    min-height: 32px;
    line-height: 32px;
    text-align: right;
    font-size: 32px;
    overflow: hidden;
    margin-left: 5%;
    color: #000;
}
.buttons{
    font-size: 0;
}
.btn{
    width: 20%;
    color: #fff;
    background: #000;
    border-radius:0;
    border: 1px solid #888;
    box-sizing: border-box;
    margin:5% 0 0 5%;
}
.btn:hover,.btn:focus{
    background-color:#1f1f1f;
    color: #fff;
}
.btn:focus,.btn:active:focus{
    outline: none;
}
.btn:last-of-type{
    width: 45%;
    background-color: #1fffff;
}
.btn:active{
    background-color: #000;
}