* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}
body {
    background-color: black;
}
.wrapper {
    width: 350px;
    height: 480px;
    margin: 65px auto;
    background-image: url('./image/wallpaper.jpg');
    background-size: cover;
    background-repeat: no-repeat ;
    border-radius: 15px;
    box-shadow: 0 10px 15 rgb(0, 0, 0, 0.1);
}
#display {
    border: none;
    outline: none;
    width: 330px;
    height: 80px;
    color: rgb(28, 177, 142);
    font-size: 58px;
    font-weight: 700;
    padding: 10px;
    text-align: right;
    background: rgb(10, 25, 64);
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
}
.button-box {
    margin: 35px 15px;
}
.btn {
    width: 60px;
    height: 60px;
    margin: 8px;
    border: none;
    outline: none;
    color: rgb(4, 211, 18);
    cursor: pointer;
    font-size: 28px;
    line-height: 30px;
    border-radius: 30px;
    background: #510bdd;
}
.btn:hover {
    background: #585bc0;
}
.cbtn, .cbtn:hover {
    background: red;
    color: #c8ff00;
}
.mbtn, .mbtn:hover {
    background: rgb(33, 0, 49);
    color: rgb(0, 96, 152);
}