.panel {
    margin-left: auto;
    margin-right: auto;
    max-width: 400px;
    margin-top: 40px;
    margin-bottom: 40px;
    background-color: rgba(128, 128, 128, 0.2);
    border: 1px solid #808080;
    padding: 0px 20px 20px 20px;
}

h2,
h3 {
    text-align: center;
}

p.form {
    width: 100%;
}

input[type=text],
input[type=password] {
    width: 100%;
}

.buttons {
    text-align: center;
    margin-top: 20px;
}