/*Style doc*/
body{
    background-color: white;
    padding-top: 20px;
    align: center;
}
button{
    border: 1px solid #dedede;
    color: #444;
    height: 45px;
    width: 65px;
    text-align: center;
    font-size: 1.2em;
    font-weight: normal;
    margin: 4.5px;
}
#content{
    width: 350px;
    padding-left: 42px;
    padding-bottom: 20px;
    margin: 0 auto;
    border: 1px solid #c0c0c0;
    border-radius: 10px;
}
#bequal{
    background-color: #4d90fe;
    border: 1px solid #3079ed;
    color: #fefefe;
    opacity: 1;
}
.display{
    width: 300px;
    height: 45px;
    text-align: right;
    font-family: monospace;
    font-size: 2em;
    font-weight: bold;
    border-color: gray;
    border-width: 1px;
    border-style: solid;
    opacity: 0.5;
}
.bn{
    opacity: 0.8;
    background-color: #f5f5f5;
}
.bop{
    opacity: 0.9;
    background-color: #B1B6B8;
}