the video above has an example of what it would look like![which is also my video]
white gradient; step 1: go to media generators, click color gradient and select 'Linear Black to Transparent'.
step 2: you can either set it up as a corner gradient or a side gradient.
step 3:i set up two clips to transition with the screen effect (which i have done a tutorial on), and added a new track to drag the gradient in. drag crossfades from both ends until the transition starts.
white solid color; step 1:go to media generators and click solid color and click 'white'.
step 2: do the same thing from step 3 and it's best to turn the opacity down (drag the top of the clip down).