*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
    outline: none;
}
.container{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: whitesmoke;
   
}
.calculator{
    background-color: rgba(0, 0, 0, 0.778);
    padding: 15px;
    border-radius: 30px;
    display: grid;
    grid-template-columns: repeat(4,67px);
    
}
input{
    grid-column: span 4;
    height: 70px;
    width:260px;
    background-color: #ecf0f3;
    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;
    border: none;
    border-radius: 50%;
    margin: 8px;
    font-size: 16px;
    cursor: pointer;
}
.btn{
    background-color: darkcyan;
}
.equal{
    width:115px;
    border-radius: 40px;
    background-color: lightcoral;
}
.operation{
    background-color: lightskyblue;
}