*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family:'Times New Roman', Times, serif;
    font-weight: bold;
}
body {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: url(back.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);
}
input {
    width: 320px;
    padding: 24px;
    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: white;
    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: white;
}
button {
    width: 60px;
    height: 60px;
    margin: 10px;
    color: white;
    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: 0px 1px 5px 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: white;
    background: orange;
}
.equalBtn {
    background-color: rgb(255, 85, 0);
}
.operator {
    color: orange;
}