*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
    font-weight: bold;
}
body{
    width: 100%;
    height: 100vh;
    display:flex;
    justify-content: center;
    align-items: center;
    background: url(https://img.freepik.com/free-photo/spotlights-background_1409-1800.jpg?size=626&ext=jpg);
    background-size: cover;
}

.calculator{
    padding: 20px;
    border: 2px solid black;
    border-radius: 16px;
    box-shadow: 0px 3px 15px rgba(0,0,0,0.8);
    background: rgba(0,0,0,0.5);
}
input{
    width: 320px;
    padding: 24;
    padding-right: 10px;
    margin: 10px;
    background: rgba(255,255,255,0.3);
    box-shadow:inset 0px 0px 8px rgba(0,0,0,0.4);
    font-size: 65px;
    text-align: right;
    color: #fff;
    border: solid 2px rgba(0,0,0,0.3);
    border-radius: 16px;
    text-shadow: 0px 1px 5px rgba(0,0,0,0.2);
}
input::placeholder{
    color: #fff;
}
button{
    width: 60px;
    height: 60px;
    margin: 10px;
    color: #fff;
    background: rgba(0,0,0,0.7);
    font-size:24px;
    cursor: pointer;
    border: solid 1px rgba(255,255,255,0.2);
    border-radius: 25px;
    text-shadow: -1px 2px 10px rgba(0,0,0,0.2);
    box-shadow: -1px 2px 10px rgba(0,0,0,0.5);
}

.ac, .del{
    font-size: 20px;
}
button:hover{
    color: #fff;
    background-color: #f67c14;
}
.equalBtn{
    background: #f67c14;
}
.operator{
    color: #f67c14;
}