CSS not working unless I open custom CSS editor

Site URL: https://www.earthandherflower.com/new-page-1

I'm having trouble identifying what's wrong with my code - as soon as I leave the custom CSS editor, it reverts back to how it was before the code was implemented. Can someone please help identify what's wrong with the code?

Here's the code:

//spinning text css
@media only screen and (max-width: 640px) {
#collection-608f1e4137e7102ac6e99726{
#page .page-section:nth-of-type(1) {
.sqs-video-background {
display: none;
}

.section-background {
background: url("https://static1.squarespace.com/static/5f1f3d37894ee95de5113464/t/608f4f28df42846165f0c995/1620004649252/Untitled+design+%2821%29.png");
background-repeat: no-repeat;
background-size: auto 100%;
}
}
}
}

//css turn image
@keyframes turn {
  from { transform: rotate(0deg) }

  to { transform: rotate(360deg) }
}

//size of spinning thing -desktop
#block-yui_3_17_2_1_1620006772828_5634{
    animation: turn 10s linear infinite;
  max-width:170px!important;
    }

//move 'about' text desktop
#block-yui_3_17_2_1_1620007817448_4955 {
    margin-left: 0px;
    margin-top: -100px!important;
}

//move 'about' text mobile
@media screen and (max-width: 640px) {#block-yui_3_17_2_1_1620007817448_4955 {
    margin-left: 0px;
  margin-top: -25px!important;}

}

//move spinning circle -desktop
#block-yui_3_17_2_1_1620006772828_5634 {
    margin-left: 650px!important;
    margin-top: 0px;
}

//move and size spinning thing - mobile
@media screen and (max-width: 640px) {#block-yui_3_17_2_1_1620006772828_5634 {
    margin-left: 65px!important;
  margin-top: 0px;
  max-width:180px!important}

}

Hi. Can you describe more clearly? What is the above code for? If it works, what will happen?

HI! Thank you so much for replying!! The code is supposed to style the page from this: to this:

When I click on "Custom CSS" everything goes where it's supposed to, but when I refresh the page it doesn't stay. Is there something I'm missing from the code? I added !important to parts of the code to see if it'd help but it didn't affect the issue at all.