style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

body{
    background: #2980b9;
}

.main{
    background: #fff;
    width: 90%;
    max-width: 600px;
    border-radius: 10px;
    padding: 20px ;
    margin: 100px auto 0;
}

.main h1{
    font-size: 30px;
    color: #ce7312;
    font-weight: 600;
    border-bottom: 1px solid #333;
    padding-bottom: 20px;

}


.main h2{
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 20px;
}

.buttons{
    display: flex;
}
.btn{
    background: #fff;
    width: 100%;
    font-weight: 500;
    border:1px solid #333;
    padding: 10px;
    margin: 10px 0;
    text-align: left;
    border-radius: 7px;
    cursor: pointer;
    transition: all 0.4s;
}

.btn:hover:not([disabled]){
    background:#333;
    color: #ce7312;
}

.btn:disabled{
    cursor: not-allowed;
}

#next-btn{
    background: chartreuse;
    width: 160px;
    font-weight: 600;
    border: 0;
    border-radius: 10px;
    padding: 10px;
    margin: 20px auto  0;
    display: block;
    cursor: pointer;

}

#prev-btn{
    background: chartreuse;
    width: 160px;
    font-weight: 600;
    border: 0;
    border-radius: 10px;
    padding: 10px;
    margin: 20px auto  0;
    display: block;
    cursor: pointer;
    display: none;
}


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

/* .quiz{

} */