To have an image show on your webpage, a link must be inserted with the <img> tag. The two attibutes required are src which specifies the path to the image and alt which specifies alternate text for the image. You can use style to specify the height and width of the image in pixels which is really important.
CSS Colors.
You can set the color of just about any element like text, background, border, etc. They are specified by using RGB values, HEX values, HSL values, RGBA values, and HSLA values. There is also an option to have each color at a different value by changing the transparency.
CSS Background.
Setting the background color in css is easy, all you need to do is insert a valid color name like this: body { background-color: lightblue; } You can even set the background color for any html element like <h1> <p> or <div> In each of those tags you can adjust the opacity on a scale from 0.0-1.0 however when using RGBA color values the scale is 0%-100%