body {font-family: Arial, Helvetica, sans-serif; font-size: 13px; color: black;  margin: 0}
#hellogoodbye {margin: 0 auto; margin-top:50px; width: 300px; background: #FFF; border-style: solid; border-width: 5px; border-color: #29c029; padding:20px; text-align: center}
.centrebutton {background: #29c029; border-radius: 5px; color: white; font-weight: bold; 
    text-decoration: none; margin:auto; padding: 10px; display:block;}
p#centred {align: center}
p#err_msg { color:#F00; font-weight:bold}
.myPopup {position: fixed; box-shadow: 10px 10px 5px rgba(31, 31, 31, 0.5); border: 2px solid #2a8a8f; border-radius: 10px;
    padding: 10px; margin: 0 0 0 -200px;  z-index: 1; left: 50%; top: 100px; width: 400px; background-color: white;}
.myPopup p {text-align: center}