body{
    background-color: rgb(186, 189, 194);
    font-family: 'Open Sans', sans-serif;

}
#container{
    width: 1000px;
    height: 550px;

    margin: 10px auto;
    background-color: rgba(186, 189, 194, 0.4);
}
#calculator{
    width: 320px;
    height: 520px;
    background-color: #eaedef;
    top: 20px;
    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);
    margin: 0 auto; 
}
#result{
    height: 120px;
}
#history{
    text-align: right;
    height: 20px;
    margin: 0 20px;
    padding-top: 20px;
    font-size: 15px;
}
#output{
    text-align: right;
    height: 60px;
    margin: 10px 20px;
    font-size: 30px;

}
#keyboard{
    height: 400px;
}
.operator,.number,.empty{
    width: 50px;
    height: 50px;
    margin: 15px;
    float: left;
    border-radius: 50%;
    border-width: 0;
     font-size: 15px;
     font-weight: bold;
}
.number,.empty{
    background-color: #eaedef;
}
.operator,.number{
    cursor: pointer;
}
.operator:active,.number:active{
    font-size: 14px;
}
.operator:focus,.number:focus,.empty:focus{
    outline: 0;
}
button:nth-child(4){
    font-size: 20px;
    background-color: #20b2aa;
}
button:nth-child(1){
    font-size: 20px;
    background-color: red;
}
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;
}
.myfooter{
    display: inline;
    margin: 1rem auto;
    width: 100%;
    text-align: center;
    position: relative;
    color: white;

}