html,
body {
  height: 100%;
  width: 100%;
  font-size: 13px;
}
body {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #FFFFFF;
}
.form-signin {
    width: 100%;
    width: 330px;
    padding: 15px;
    margin: auto;
}
button {
    font-size: 12px;
}