Ui_template HDMI_TV_control - fixed css flashing

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CSS is fine. You can test the blinking with single template node.

<style>
    :root{
        --remote-button-background:red;
        --remote-button-foreground:blue;
    }
    .remote-button.blinking{
    	animation:blinkingAnim1 0.8s infinite;
    }
    @keyframes blinkingAnim1{
    	0%{		background-color: var(--remote-button-background); color:var(--remote-button-foreground);}
    	50%{	background-color: var(--remote-button-foreground); color:var(--remote-button-background);}
    	100%{	background-color: var(--remote-button-background);	color:var(--remote-button-foreground);}
    }
</style>
<div class="remote-button blinking">BUTTON</div>