Is there a way to change the z-index of our chat widget?

I tried uploading a css file to change the z-index of my chat widget and float button on the Change Chat Window Appearance with Custom CSS File feature but it is not working. I change it because it is overlapping our custom cookie dialog.

.zls-sptwndw {

position: fixed;

display: none;

bottom: 0;

cursor: pointer;

z-index: 0!important;

}

.zsiq_floatmain {

position: fixed;

z-index: 0!important;

max-width: 305px;

box-sizing: border-box;

}

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