Note: This only works on Flows using the Grid theme.
Before
After
Remove the username
First you need to remove the @username in the hover. Paste this CSS code in your 'Custom CSS' in Setup & Styling.
.bzfy-feed p {
display: none;
}
Add your custom text
Then paste this CSS code in your 'Custom CSS' in Setup & Styling to add custom text. Write the color code you want in 'color' and your custom text in 'content'.
In this snippet, a white color and the text SHOP NOW is selected.
.bzfy-c-tilegrid-post__minimalistic-overlay:after {
content:'SHOP NOW';
color: #FFFFF;
font-size: 1em;
font-weight: bold;
text-align: center;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: rgba(0,0,0, 0);
position: absolute;
padding-top: calc(50% - 10px);
}