* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-image: linear-gradient(90deg, rgb(144, 0, 255), rgb(255, 0, 187));
}

.app{
    background: #fff;
    width: 90%;
    max-width: 600px;
    margin: 100px auto 0;
    border-radius: 10px;
    padding: 30px;
}

.app h1 {
    font-size: 25px;
    color: #001e4d;
    font-weight: 600;
    border-bottom: 1px solid #333;
    padding-bottom: 30px;
}

.quiz {
    padding: 20px 0;
}

.quiz h2 {
    font-size: 18px;
    color: #001e4d;
    font-weight: 600;
}

.btn {
    background: #fff;
    color: #222;
    font-weight: 500;
    width: 100%;
    border: 1px solid #222;
    padding: 10px;
    margin: 10px 0;
    text-align: left;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn:hover:not([disabled]) {
    background-image: linear-gradient(90deg, rgb(144, 0, 255), rgb(255, 0, 187));
    color: #fff
}

.btn:disabled{
    cursor: no-drop;
}

#next-btn{
    background-image: linear-gradient(90deg, rgb(144, 0, 255), rgb(255, 0, 187));
    color: #fff;
    font-weight: 500;
    width: 150px;
    border: 0;
    padding: 10px;
    margin: 20px auto 0;
    border-radius: 4px;
    cursor: pointer;
    display: none;
}

.correct{
    background: #9aeabc;
}
.incorrect{
    background: #ff9393;
}

#ex-box{
    border: 2px solid black;
    background: rgb(61, 197, 251);
    color: #000000;
    font-weight: 500;
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    text-align: left;
    border-radius: 4px;
    display: none;
}

#ex-box h2{
    text-decoration: underline;
}