.container {
    max-width: 600px;
    margin: 5px auto;
}

label {
    font-weight: bold;
    margin-bottom: 2px;
}

#message,
#purpose {
    resize: vertical;
}

#purpose {
    width: calc(100% - 16px);
}

input,
textarea {
    width: calc(100% - 16px);
    padding: 8px;
    box-sizing: border-box;
}

input[type="submit"] {
    background-color: #4caf50;
    color: white;
    cursor: pointer;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 400px;
    position: relative;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}