It depends on the MVP specification and your budget.
If your MVP requires a good design with good UX, and you have the budget, someone else can do it for you.
If your MVP does not require a good design or good UX, you can just download some random example and use that.
Keep in mind that using CSS, creating a design and creating a good UX are not the same thing. You can create a terrible UX with a pretty design and lots of cool CSS... Just like you can create an amazing UX and design with minimal CSS.
If your MVP requires a good design with good UX, and you have the budget, someone else can do it for you.
If your MVP does not require a good design or good UX, you can just download some random example and use that.
Keep in mind that using CSS, creating a design and creating a good UX are not the same thing. You can create a terrible UX with a pretty design and lots of cool CSS... Just like you can create an amazing UX and design with minimal CSS.