.usernameimage  { 
  width: 100%;
  max-width: 70px;
  height: auto;
  vertical-align: -4px;
}

.usernameimage:hover {        
  animation: fadeOutBottomLeft; /* referring directly to the animation's @keyframe declaration */
  animation-duration: 2s; /* don't forget to set a duration! */
  --animate-duration: 0.5s;
}