body {
    display: block;
    width: 780px;
    margin: 0 auto;
    padding: 10px;
    text-align: center;
}
p {
    text-align: left;
}
p.question {
    font-weight: bolder;
}
button {
    display:block;
    width: 600px;
    height: 28px;
    background-color: #deeefe;
    border: 2px solid #899acd;
    margin: 10px auto;
    text-align: center;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -khtml-user-select: none;
    -ms-user-select: none;
    outline : none;
}
button:active{
    background-color: #899acd;
}