css - Animate color change? -


i've never used css animations before on next project. have this:

http://jsfiddle.net/ujdkf/1/

but rather having color change i'd fill left right in same way progress bar does. possible border color? 

.box{  position : relative;  width : 200px;  height : 50px;  background-color : black;  color:white;  border-bottom: 5px solid grey;   -webkit-transition : border 500ms ease-out;   -moz-transition : border 500ms ease-out;  -o-transition : border 500ms ease-out; }  .box:hover{    border-bottom: 5px solid red; }

you can adapt answer fill background color left right css:

#box{     position : relative;     top: 10px;     left: 10px;     width : 100px;     height : 100px;     background-color : gray; } #simulate_border {     position : relative;     width : 120px;     height : 120px;     background: linear-gradient(to right, red 50%, black 50%);     background-size: 200% 100%;     background-position:right bottom;     transition:all 500ms ease; } #simulate_border:hover{     background-position:left bottom;  }

jsfiddle

diagonal progression possible - jsfiddle2


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