body{
    background-color: #2978A0;
}


#currentChain{
    font-size: 30px;
}

#currentChain, #currentResult{
    min-width: 320px;
    display: block;
    box-sizing: border-box;
    height: 60px;
    line-height: 60px;
    text-align: right;
    padding: 5px;
    float:right;
    font-family: 'Roboto Mono', monospace;
    cursor: default;
}

#screen{
    width:320px;
    overflow: hidden;
}

#calculator{
    margin-left: auto;
    margin-right: auto;
    margin-top: 5%;
    box-sizing: border-box;
    width: 320px;
    background-color: white;
    box-shadow: 0px 0px 8px 0px #000000;
}

/*clearfix because the contents are all floating*/
#calculator::after{
    content:"";
    display:block;
    clear:both;
}

button{
    display: block;
    float: left;
    margin:0;
    padding:0;
    font-family: 'Roboto', sans-serif;
    width: 80px;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    box-shadow: none;
    border: none;
    color: white;
   
}


.num-pad{
    float: left;
    width: 240px;
}

.num-pad button{
    background-color: #253031;
    font-size:30px;
    height: 80px;
}

.num-pad button:focus{
    background-color: #192021;
    outline: none;
}

.num-pad button:active{
    background-color: #344344;
}


.operator-pad{
    float: right;
    width: 80px;
}

.operator-pad button{
    background-color: #315659;
    height: 53.3333333333px;
    font-size: 20px;
}

.operator-pad button:focus{
    background-color: #233D3F;
    outline: none;
    
}

.operator-pad button:active{
    background-color: #4E898E;
}

footer{
    margin-top: 20px;
    text-align: center;
    font-family: 'Roboto', sans-serif;
    color: white;
}

footer a{
    color: #87d5fd;
}