Create a stylish website header background featuring a dark bluish hue with vibrant gradients. The background should have smooth, flowing curves and subtle abstract shapes that convey a sense of depth and modernity. Ensure the design remains minimalistic with a plain layout, allowing for versatility in text overlay. The overall aesthetic should evoke a sense of elegance and innovation, perfect for a contemporary website design.

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Create a stylish website header background featuring a dark bluish hue with vibrant gradients. The background should have smooth, flowing curves and subtle abstract shapes that convey a sense of depth and modernity. Ensure the design remains minimalistic with a plain layout, allowing for versatility in text overlay. The overall aesthetic should evoke a sense of elegance and innovation, perfect for a contemporary website design.