Themes
Themes is a great feature which lets you apply new styles to Vivaldi's interface. You can customize Vivaldi's interface either with default themes or create your own style.
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Go to Settings Page / Themes and choose a theme.
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You can also start to create your own theme by pressing plus (+) button.
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Choose your favorite colors via color picker tool.
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If you need, you can use the Contrast Adjustments setting to achieve better accessibility.