style.css

body{
    font-family: 'Open Sans',sans-serif;
    background-color: black;
}
#container{
    width:1000px;
    height:550px;
    background-image: linear-gradient(rgba(0,0,0,0.3),rgba(0,0,0,0.3)), url(bgimg.jpg);
    margin: auto;
}
#calculator{
    width: 320px;
    height: 520px;
    background-color: #eaedef;
    margin: auto;
    top:15px;
    position: relative;
    border-radius: 5px;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
}
#result{
    height: 120px;
}
#history{
    text-align: right;
    height: 20px;
    margin: 10px 20px;
    padding-top: 20px;
    font-size: 15px;
    color: #919191;
}
#output{
    text-align: right;
    height: 60px;
    margin: 0 20px;
    font-size: 30px;
}
.operator, .number, .empty{
    width: 50px;
    height: 50px;
    margin: 15px;
    float: left;
    border-radius: 50%;
    border-width: 0px;
    font-weight: bold;
    font-size: 15px;
    text-align: center;
}
.operator, .number{
    cursor: pointer;
    background-color: #d5dadd;
}
.operator:active, .number:active{
    font-size: 13px;
}
button:nth-child(4){
    font-size: 20px;
    background-color: #20b2aa;
}
button:nth-child(8){
    font-size: 20px;
    background-color: #ffa500;
}
button:nth-child(12){
    font-size: 20px;
    background-color: #f08080;
}
button:nth-child(16){
    font-size: 20px;
    background-color: #7d93e0;
}
button:nth-child(20){
    font-size: 20px;
    background-color: #9477af;
}
#keyboard{
    height: 400px;
}