styles.css

input[id='quantity']{
    width: 40px;
}

body {
    background-color: #D3D3D3;
}

.button {
    background-color: #00008B;
    border: none;
    color: white;
    padding: 10px 16px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: -10px 2px;
    cursor: pointer;
    border-radius: 10px;
    transition-duration: 0.3s;
    border: 2px solid #00008B;
}

.button:hover {
    background-color: lightgrey;
    color: #00008B;
    box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
}

h1 {
    text-align: center;
}

#question {
    text-align: center;
    margin: 25px;
    border-style: solid;
    border-width: 3px;
    border-color: #00008B;
    width: fit-content;
    margin: auto;
}

.content {
    text-align: center;
    margin: 5px;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

#quantity, #submitButton, #score {
    margin-top: 20px;
}

@media screen and (max-width:769px){
    .content {
        font-size:16px;
    }
}