wave {
    animation-name: wave-animation;  
    animation-duration: 2.5s;        
    animation-iteration-count: infinite;  
    transform-origin: 70% 70%;       
    display: inline-block;
  }
  
  @keyframes wave-animation {
      0% { transform: rotate( 0.0deg) }
     10% { transform: rotate(14.0deg) }  
     20% { transform: rotate(-8.0deg) }
     30% { transform: rotate(14.0deg) }
     40% { transform: rotate(-4.0deg) }
     50% { transform: rotate(10.0deg) }
     60% { transform: rotate( 0.0deg) }  
    100% { transform: rotate( 0.0deg) }
  }