*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    color: #333;
}
body{
    font-family: sans-serif;
/*    min-height: 100vh;*/
    color: #fff;
    background-color: white;
}
.example{
/*    max-width: 400px;*/
/*    border: thin solid #e4e4e4;*/
    padding: 20px;
}
.example h2{
    margin-bottom: 30px;
    text-align: center;
}
.example form{
    width:  400px;
    margin: 0 auto;
    border: thin solid #e4e4e4;
    padding: 20px;
    
}
.example input{
    display: block;
    width:  100%;
    margin-bottom: 30px;
    padding: 10px;
    font-size: 16px;
}

.example input[type=submit]{
    
    margin-top: 30px;

}

.example input:focus{
    outline: none;
}
.example .error{
    color: darkred;
}
.example .output{
    margin-bottom: 20px;
    font-size: 18px;
    line-height: 30px;
}

.example strong{
    color: darkred;
    font-weight: normal;
}