image not shoing to full width

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so i have added a linked image , the image ratio is 1200*344. the image is in assets folder. also there is no spacing between the menu and the image how do i add spacing to that ?

aso the image does not start from the extreme left .this is my store

    <a href="" target="_top"><img src={{ "black_01.jpg" | asset_url }}  alt="black" border="0" /> </a>