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<svg>
    <rect width="300" height="150" class="kk"/>
</svg>

@keyframes as{
    0%{
        fill: gold;
    }
     25%{
        fill: palevioletred;
    }
     50%{
        fill: salmon;
    }
     75%{
        fill:skyblue;
    }
     100%{
        fill: slateblue;
    }
   
}
.kk{
    animation: as 4s;
}