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<h2>Welcome</h2>

<style>
  
h2{
background: right / 0% 100% no-repeat linear-gradient(#c1f5ee, #c1f5ee);
transition: background-size 500ms;
}

h2:hover{
  background: left / 100% 100% no-repeat linear-gradient(#c1f5ee, #c1f5ee);
  cursor: pointer;
} 

</style>