/* Add custom CSS styles below */ 
.tabs__product .tab-trigger {
    background-color: #414042;
    background-color: var(--color-primary);
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    border-top-left-radius: .375rem;
    border-top-right-radius
Defines the radii of the top right outer border edge.

Widely available across major browsers (Baseline since January 2018)
Learn more

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: .375rem;
    color: #ffffff;
    padding: .5rem;
}
.btn-primary, .s-button-primary {
    color: #ffffff;
}