@-webkit-keyframes swing { 
    20%, 40%, 60%, 80%, 100% { -webkit-transform-origin: top center; } 
    20% { -webkit-transform: rotate(15deg); } 
    40% { -webkit-transform: rotate(-10deg); } 
    60% { -webkit-transform: rotate(5deg); } 
    80% { -webkit-transform: rotate(-5deg); } 
    100% { -webkit-transform: rotate(0deg); } 
} 
@keyframes swing { 
    20% { transform: rotate(15deg); } 
    40% { transform: rotate(-10deg); } 
    60% { transform: rotate(5deg); } 
    80% { transform: rotate(-5deg); } 
    100% { transform: rotate(0deg); } 
} 
.swing.hpfxgo { 
    -webkit-transform-origin: top center; 
    transform-origin: top center; 
    -webkit-animation-name: swing; 
    animation-name: swing; 
}