I want the keyframe "smoothly" to do its thing when the button is hovered over. 
It works great, but when the animation restarts, I want it to freeze at the end.
I have looked at some places, but I can't find anything that solves my problem.
My code:
#en {
    display: inline-block;
    padding: 0.3em 1.2em;
    border:0.16em solid rgba(255,255,255,0);
    font-weight: 300;
    border-radius: 0em;
    border-color: #4ef18f;
    background-color: #4ef18f;
}
@keyframes smoothly {
    from {background-color: #43f18f;}
    to {background-color: #bbecd0;}
    from {border-radius: 0em;}
    to {border-radius: 4em;}
}
#en:hover {
    animation-name: smoothly;
    animation-duration: 1s;
}
 
     
    