Here is a special snippet to change page “My Account”.

Just like this: the Travel’s template is used for this example.

To do that, just add the following css in the “advanced customization” section of your editor:

.customer-view .item.item-custom {
border-radius: 30px;
text-transform: uppercase;
margin: 10px;
}

Information:

box-radius – it’s rounded corners

text-transform – concerned the case of your font

margin – spaces between different elements

Obviously, you can change the values of border-radius or margin.
exemple: border-radius: 10px

Don’t forget, the lisibility is very important.