*{
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

body{
    background: #F0F1F2;
}

.app{
    background: #fff;
    width: 90%;
    max-width: 600px;
    margin: 100px auto 0;
    border-radius: 10px;
    padding: 40px; 
}

.app h1{
    font-size: 25px;
    color: burlywood;
    font-weight: 600;
    border-bottom: 1px solid #333;
    padding-bottom: 35px;
}

.tracking{
    padding: 20px 0;
}

.tracking h2{
    font-size: 20px;
    color: burlywood;
    font-weight: 600;
}

.btn{
    background: #fff;
    color: #222;
    font-weight: 500;
    width: 100%;
    border: 1px solid #222;
    padding: 10px;
    margin: 10px 0;
    text-align: center;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn:hover:not([disabled]){
    background: #222;
    color: #fff;
}

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

#next-btn{
    background: fixed;
    color: #fff;
    font-weight: 500;
    width: 150px;
    border: 0;
    padding: 10px;
    margin: 20px auto 0;
    border-radius: 10px;
    cursor: pointer;
    display: none;
}