@mbthemes
I see logo size is 200x50 (600 pixel) I guess.
I see your Osclass logo in the theme is 480x140 600 pixel png,  which one is standard. . ?.

2. what's the dimensions of the different banners, I'm thinking to greate a gif or some image and expecting to be on the edge nicely. ?.

3. I'm thinking to change the the slider in the serach jpeg file into a plain color. need your assistant how to do.

#home-search .slide {animation: breath 45s linear alternate infinite;background:#999 url('../images/slide/slide.jpg') no-repeat center center;background-size:cover;z-index:1;position:absolute;left:0;top:0;right:0;bottom:0;} ?

Thank you

1. I think 200x80 is sufficient
2. Ideally use responsive layout
3. Replacd images in images/slide folder of theme

Thanks,
point 3, I need to remove the slider image, completely and change into simple green color.

#home-search .slide {animation: breath 45s linear alternate infinite;background:#999 url('../images/slide/slide.jpg') no-repeat center center;background-size:cover;z-index:1;position:absolute;left:0;top:0;right:0;bottom:0;} ?

@codebarre
Change:
background:#999 url('../images/slide/slide.jpg') no-repeat center center;

into i.e.:
background:#ccc;

Thank you it worked