*{
margin:0;
padding:0;
box-sizing: border-box;
background-color: #b9d3e9;
font-family: sans-serif;
outline: none;

}

.container{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
.calculator{
    background-color: #ecf0f3;
    padding: 15px;
    border-radius: 30px;
    box-shadow: inset 5px 5px 12px #ffffff,
                      5px 5px 12px rgba(0, 0, 0, 0.16);
    display: grid;
    grid-template-columns: repeat(4,68px);                  
                      
}

input{
    grid-column: span 4;
    height: 70px;
    width: 260px;
    background-color: #ecf0f3;
    box-shadow: inset -5px -5px 12px #ffffff,
                inset  5px  5px 12px rgba(0,0,0,.16);
    border: none;
    border-radius: 30px;
    color: rgb(70, 70, 70);
    font-size: 50px;
    text-align: end;
    margin: auto;
    margin-top: 40px;
    margin-bottom: 30px;
    padding: 20px;
}

button{
    height: 48px;
    width:48px;
    background-color: #ecf0f3;
    box-shadow:-5px -5px 10px #cacdd6,
                 3px  3px 10px rgba(0,0,0,.16); 
    border: none;
    border-radius: 50%;
    margin: 8px;
    font-size: 16px;
}

.equal{
    width: 115px;
    border-radius: 40px;
    background-color: #ecf0f3;
    box-shadow:-5px -5px 12px #ffffff,
                 5px  5px 12px rgba(0,0,0,.16); 
}