.maileon {
    clear: both;
    max-width: 600px;
    margin: 20px auto;
}

.maileon form {
    
    display: flex;
}

.maileon form input {
    flex-grow: 1;
    margin-right: 20px;
    padding: 10px;
    border: 1px solid rgba(0,0,0,0.25);
}

.maileon form button {
    padding: 10px;
    background-color: #99deee;
    border: none;
}

.maileon p {
    margin: 10px 0;
}