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AFAIK, That is not chart.js adding a background color to your component but rather your browser displaying that you have this area under selection. I don’t think this can be resolved unless you disable selection of the chart by adding this CSS to it.
.noselect {
-webkit-touch-callout: none; /* iOS Safari */
-webkit-user-select: none; /* Safari */
-khtml-user-select: none; /* Konqueror HTML */
-moz-user-select: none; /* Firefox */
-ms-user-select: none; /* Internet Explorer/Edge */
user-select: none; /* Non-prefixed version, currently
supported by Chrome and Opera */
}
Source:stackexchange.com