style.css

body{
    background-color: #F5F5F5;
    position: relative;
}

h2{
    text-align: center;
    font-size: 40px;
    color: #3498DB;
}

h3{
    text-align: center;
    font-size: 32px;
    color: #E74C3C;
}


.calculator{
    background-color: azure;
    align-items: center;
    position: absolute;
    top: 170px;
    left: 30.5%;
    border: 3px solid orangered;
    padding-top: 10px;
    padding-bottom: 10px;
    padding-left: 20px;
    padding-right: 20px;
    border-radius: 7px;
}

.calculator form input{
    border: 0;
    outline: 0;
    height: 50px;
    width: 50px;
    border-radius: 5px;
    margin: 10px;
    box-shadow: -8px -8px 15px rgba(255,255,255,0.1),5px 5px 15px rgba(0,0,0,0.2);
    background: transparent;
    font-size: 20px;
    color: black;
    cursor: pointer;
}

#display{
    background-color: #2E86C1;
    width: 490px;
    height: 70px;
    text-align: right;
    box-shadow: none;
    font-size: 45px;
}

.clear{
    background-color: #C0392B !important;
}

.equal{
    background-color: aquamarine !important;
    width: 125px !important;
}

.operator{
    background-color: #27AE60 !important;
}

.other{
    background-color: rgb(255, 94, 0) !important;
}