.element.mandatory {
    margin-bottom: 20px;
}

.element.mandatory .validation {
    display: none;
    color: red;
    font-size: 14px;
    margin-bottom: 5px;
}

.element.mandatory.invalid .validation {
    display: block;
}

.element .first {
    margin-bottom: 5px;
}

.element .first label {
    display: block;
    font-weight: bold;
    color: #333;
}

.element .second input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.element.mandatory.invalid .second input[type="text"] {
    border-color: red;
}

.element .second button {
    width: 100%;
    padding: 15px;
    background-color: #00BCD4;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    text-transform: uppercase;
}

.element .second button:hover {
    background-color: #0097A7;
}