style.css

body {
    background-image: url(wallpaper.jpg);
    background-size: cover;
    display: flex;
    direction: ltr;
    justify-content: center;
    margin: 50px;
    margin-top: 200px;
}

.calculator-border {
    text-align: center;
    height: 500px;
    width: 500px;
    border: 1px solid;
    border-color: black;
    border-radius: 20px;
    position: center;
    background-color: rgb(70, 69, 69);
}

.calculator-screen-border {
    background-color: rgb(105, 194, 105);
    margin: 20px;
    height: 60px;
    border: 1px solid black ;
    border-width: 1px;
    border-radius: 5px;
}

.calculator-screen {
    padding-right: 5px;
    padding-left: 5px;
    text-align: end;
    margin: 5px;
    height: 5px;
    font-size: 38px;
    font-variation-settings: 20px;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
}

.buttons > button{
    font-size: 27px;
    padding: 15px;
    width: 100px;
    margin: 5px;
    color: whitesmoke;
    background-color: rgb(150, 150, 150);
}

.buttons > button:hover {
    background-color: rgb(94, 94, 94);
}

#clear-screen {
    width: 163px;
    background-color: rgb(185, 90, 90);
}

#clear-screen:hover {
    background-color: rgb(116, 56, 56);
}

#erase {
    width: 150px;
}

#zero {
    width: 214px;   
}

#equals {
    width: 214px;
    background-color: rgb(36, 32, 32);
}

#equals:hover {
    background-color: rgb(61, 59, 59);
}

#addition {
    background-color: rgb(36, 32, 32);
}

#addition:hover {
    background-color: rgb(61, 59, 59);
}

#substraction {
    background-color: rgb(36, 32, 32);
}

#substraction:hover {
    background-color: rgb(61, 59, 59);
}

#division {
    background-color: rgb(36, 32, 32);
}

#division:hover {
    background-color: rgb(61, 59, 59);
}

#multiplication {
    background-color: rgb(36, 32, 32);
}

#multiplication:hover {
    background-color: rgb(61, 59, 59);
}