How to create a responsive multi columns paragraph

As long as I understand, the webflow widget doesn’t allow to have columns one under the other in desktop mode, but just in tablet and mobile. So in desktop mode it just squeezes my two columns.

I’m trying with custom code.
In the w3schools editor I managed to have more or less what I want, adding “column-width”.
Now I’m trying to add it to my paragraph class called “slide paragraph”, but it doesn’t work.
I’m a total noob, so maybe its just something easy to fix.

I added in the tag this:

<style> 
.slide description {
    -webkit-column-count: auto; /* Chrome, Safari, Opera */
    -moz-column-count: auto; /* Firefox */
    column-count: auto;
    -webkit-column-gap: 40px; /* Chrome, Safari, Opera */
    -moz-column-gap: 40px; /* Firefox */
    column-gap: 40px;
    -webkit-column-width:300px
    -moz-column-width:300px
    column-width:300px; 
}
</style>