#show_message {
visibility: hidden;
min-width: 250px;
margin-left: -125px;
color: #fff;
text-align: center;
border-radius: 2px;
padding: 16px;
position: fixed;
z-index: 1;
left: 50%; font-size: 17px;
}
#show_message.show {
visibility: visible;
-webkit-animation: fadein 0.7s, fadeout 0.7s 2.5s;
animation: fadein 0.7s, fadeout 0.7s 2.5s;
}
@-webkit-keyframes fadein {
from {opacity: 0;} 
to {opacity: 1;}
}
@keyframes fadein {
from {opacity: 0;}
to {opacity: 1;}
}
@-webkit-keyframes fadeout {
from {opacity: 1;} 
to {opacity: 0;}
}
@keyframes fadeout {
from {opacity: 1;}
to {opacity: 0;}
}