Помогите border radius animation

.class1 { 
    padding: 10px; 
    background-color: blue; 
    width: 100px; 
    color: white; 
    border-radius: 50px; 
    -webkit-animation: rotate 6s linear infinite,switchSize 1s infinite !important; 
    animation: rotate 6s linear infinite,switchSize 1s infinite !important; 
} 
 
 
@keyframes switchSize { 
  50% { 
    border-radius: 10px; 
  } 
}

<div class="class1">123</div>