* {
    padding: 0;
    margin: 0;
}


body {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: roboto;
    background-color: rgba(235, 235, 235, 0.467);
    height: 80vh;
}

#buttons {
    display: flex;
    height: 100px;
    flex-wrap: wrap;
    width: 480px;
    justify-content: space-between;
    /* gap: 10%; */
}

#buttons button {
    width: 25%;
    height: 100px;
    border-radius: 15px;
    font-size: 20px;
    border: 1px solid grey;
    padding: 1%;
}

#buttons button:hover {
    background-color: rgba(154, 154, 154, 0.417);
    border: none;
    cursor: pointer;
}

.operator {
    background-color: rgb(104, 202, 255);
}

#buttons .operator:hover {
    background-color: rgba(104, 202, 255, 0.465);
}

#buttons #delete {
    width: 75%;
    background-color: rgba(255, 77, 77, 0.773);
}

#buttons #clear {
    background-color: rgba(255, 77, 77, 0.773);
}

#buttons #delete:hover, #buttons #clear:hover {
    background-color: rgba(255, 77, 77, 0.503);
}

#buttons #equal:hover {
    background-color: rgba(58, 179, 80, 0.521);
}

#equal {
    background-color: rgb(58, 179, 80);
}

h1 {
    padding: 20px;
}

#screen {
    background-color: rgba(128, 128, 128, 0.135);
    height: 150px;
    width: 460px;
    border-radius: 20px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    font-size: 50px;
    padding-right: 20px;
}


@media only screen and (max-width: 720px) {
    #screen {
        width: 100%;
        height: 80px;
    }

    #buttons {
        width: 100%;
    }
    
}