.alternada{
    list-style: upper-alpha;
    font-size: 30px;
    color:indigo;
}
.botao{
    display:block;
    width:20%;
    padding:10px 15px;
    border:0;
    background:#333;
    color:#fff;
    border-radius: 5px;
    margin: 5px 0;
}
input[type='text']{
    width:30%;
    padding:8px;
    margin-bottom:10px;
    border-radius:5px;
    border:1px solid #ccc;
}

.problema{
    background:red;
    color:cornsilk;
    padding:5px;
    margin:5px;
}