Hi there!
After I searched a lot on Google, I decided to ask here. I need to change the color of my prices, both on the product grid and also on the product page. I also want to try out a different max-width of the whole page.
Can someone help me? 
Thanks and best regards
Max
Hello There,
Please share your store URL and Screenshot.
So that I will check and let you know the exact solution here.
hello @Max_Barius
Please provide website url and if your store is password protected then also provide password So I will check and provide a solution here.
hello @Max_Barius
please Go to Online Store->Theme->Edit code then go to assets/theme.css ->paste below code at the bottom of the file.
.template-collection #shopify-section-collection .collection__products .product-grid .product-item .old-price {
color: #ea0b0f;
}
.template-product .grid__item .form__wrapper .h5--body.product__price .product__price--strike{
color: #ea0b0f;
}
Thanks for your reply. Unfortunately, this only changes the “crossed-out” price and not the actual price.
Also: How do I change the max-width for the whole page? 
Best regards
Max
hello @Max_Barius change the max-width for the whole page add below css
please Go to Online Store->Theme->Edit code then go to assets/theme.css ->paste below code at the bottom of the file.
@media only screen and (min-width: 989px){
.template-collection .collection__products{
padding: 12px 0 !important;
}
}