Vibrant Colours of Powers

Number Theory Level 2

$\huge {\color{#D61F06}1\color{#20A900}8^{\frac{\color{#3D99F6}3\color{#EC7300}4\color{#624F41}3}{\color{#BA33D6}7}} \times \color{#EC7300}3^{\frac{\color{#BA33D6}1\color{#3D99F6}2\color{#20A900}3\color{#EC7300}4\color{#D61F06}5}{\color{#20A900}1\color{#D61F06}5}}}$

Find the last digit of given expression above.