*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
    }
    body{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(45deg, #0a0a0a, #3a4452);
    }
    .calculator{
    border: 1px solid #717377;
    padding: 20px;
    border-radius: 16px;
    background: transparent;
    box-shadow: 0 3px 15px rgba(113,115,119,0.5);
    }
    input{
    width: 320px;
    border: none;
    padding: 24px;
    margin: 10px;
    background: transparent;
    box-shadow: 0 3px 15px rgba(84,84,84,0.1);
    text-align: right;
    color: #fff;
    font-size: 40px;
    cursor: pointer;
    background-color: rgb(160, 159, 159);
    border-radius: 2%;
    }
    input::placeholder{
    color: #fff;
    }
    button{
    width: 60px;
    height: 60px;
    margin: 10px;
    border-radius: 50%;
    color: #fff;
    background: transparent;
    border: none;
    font-size: 20px;
    box-shadow: -8px -8px 15px rgba(255,255,255,0.1);
    cursor: pointer;
    }
    .operation{
    color: #6dee0a;
    }
    .btnZero{
    width: 150px;
    box-shadow: -8px -8px 15px rgba(255,255,255,0.1);
    }
    .equalBtn{
    background-color: #fb7c14;
    }