fix server side render style mismatch on hashloader

[davidhu2000]

What changes are introduced?

fixes #531. The content style is causing a mismatch between server/client styles.

position:absolute;
- content:;
top:50%;
left:50%;
display:block;
width:10px;
height:10px;
border-radius:5px;
transform:translate(-50%, -50%);
animation-fill-mode:none;
animation:react-spinners-HashLoader-before 2s infinite"

The client-side style includes content: "", but looks like the server-side removes it. It seems like this style isn't adding any value, so removing it seems like the best option.

Any screenshots?

[liby]

but looks like the server-side removes it. It seems like this style isn't adding any value,

Excuse me. Why does this kind of behavior occur?

[davidhu2000]

I'm not 100%, but my guess is nextJs optimizes the style and removed any that has an empty value.

Given that content:"" doesn't really add anything