body{
    background-color: aqua;
}
*{
    margin: 0%;
    padding: 0%;
    font-family: 'poppins', sans-serif;
    box-sizing: border-box;
}
.a{
    width: 100%;
    height: 100vh;
    background: #e3f9e3;
    display: flex;
    align-items: center;
    justify-content: center;
}
.b{
    padding: 20px;
    border-radius:10px ;
    background: #3a4452;
}
.b form input{
    border: 0;
    outline: 0;
    width: 60px;
    height: 60px;
    border-radius: 10px;
    box-shadow: -8px -8px 15px  wheat , 5px 5px 15px brown; 
    background: transparent;
    font-size: 20px;
    color: #fff;
    cursor: pointer;
    margin: 10px;
    
}
form .display{
    display: flex;
    justify-content: flex-end;
    margin: 20px 0;
}
form .display input{
    text-align: right;
    flex: 1;
    font-size: 45px;
    background-color: #e3f9e3;
    box-shadow: black -8px -8px 15px ,5px 5px 5px black;
    color: black;
}

form input.e{
    width:125px;
    color: aqua;
}
form input.k{
    color: aqua;
}