Write the HTML code to display the following output. Keep any image as the background on the webpage and display the following data.

[tex]\[
\begin{array}{l}
\text{Scientific Formula:} \quad H_2 + O_2 = H_2O \\
\text{Mathematical Formula:} \quad a^2 + b^2 = a^2 + 2ab + b^2
\end{array}
\][/tex]

(Note: Provide the HTML code to achieve this layout.)