*{
    margin: 0;
    padding: 0;
    font-family: 'Times New Roman', Times, serif;
    box-sizing: border-box;
}
.container{
    width: 100%;
    height: 100vh;
    background: #e3f9ff;
    align-items: center;
    justify-content: center;
    display: flex;
}
.calculator{
    background-color: #3a4452;
    padding: 20px;
    border-radius: 16px;
}
.calculator form input{
    outline: 0;
    width: 60px;
    height: 60px;
    border-radius: 10px;
    box-shadow: -5px -5px 10px rgb(255,255, 255, 0.1), 5px 5px 10px rgba(0, 4, 5, 0.2); 
    background-color:transparent;
    font-size: 20px;
    color: #ffff;
    cursor: pointer;
    margin: 10px;
}

.calculator form input:active{
    border-color:aqua;
}
    
form .display{
    justify-content: flex-end;
    margin: 20px 0;
    display: flex;
}
form .display input{
    flex: 1;
    font-size: 35px;
    text-align: right;
    box-shadow: none;
}
form input.equal{
    width: 145px;
    color: aqua;
}
form input.operator{
    color: aqua;
}
footer{
    flex: 1;
    font-size: 12px;
    margin-left: 210px;
    margin-bottom: -15px;
    color: rgb(108, 201, 201);
}
footer :hover{
color: aqua;
cursor: pointer;
}