How to place an item under another item using flxbox? - html

Question

I have a JS fiddle here and it's pretty simple what I want to happen but difficult for me to execute it. In the fiddle, you notice there is a red box. I want that red box to be displayed under the text "Join Balance...". I am not sure how to do this.
Can somebody help me?
Fiddle: https://jsfiddle.net/f2h390wc/
HTML and CSS:
/* newsletter section */
#custom_html-5 {
width: 100%;
background-color: #f2f2f2;
padding-bottom: 40px;
padding-top: 20px;
margin-bottom: 70px;
padding-left: 70px !important;
padding-right: 20px !important;
}
.newsletter_inner_section {
display: flex;
}
.newsletter_gif {
width: 200px;
height: auto;
}
.newsletter_left,
.newsletter_center,
.newsletter_right {
display: inline-flex;
}
.newsletter_left {
width: auto;
}
.newsletter_center {
width: 100%;
align-items: center;
}
.newsletter_right {
background: red;
width: 40%;
justify-content: flex-end;
}
.newsletter_text_section {
color: black !important;
font-size: 24px !important;
font-weight: bold;
}
.eVEmvD.eVEmvD.eVEmvD.eVEmvD.eVEmvD.eVEmvD {
width: fit-content !important;
padding: 0 20px;
}
.fGCWnQ.fGCWnQ {
justify-content: flex-end;
}
.kvTDNe.kvTDNe {
display: unset;
}
/* Media Newsletter section only */
#media (max-width:1144px) {
#custom_html-5 {
padding-left: 20px !important;
padding-right: 20px !important;
}
.newsletter_inner_section {
width: 100% !important;
justify-content: center;
display: flex;
}
.newsletter_center,
.newsltter_right {
flex-direction: column !important;
}
}
<!-- newsletter section -->
<div class="newsletter_section">
<div class="newsletter_inner_section">
<div class="newsletter_left">
<img src="https://balancecoffee.co.uk/wp-content/themes/balancecoffeechild/img/newsletternnobkg2.gif" alt="Balance Newsletter" style="padding-right:30px;" class="newsletter_gif">
</div>
<div class="newsletter_center">
<p class="newsletter_text_section">Join Balance and get 20% off your first order</p>
</div>
<div class="newsletter_right">
<div class="newsletter_input_section">
<div class="klaviyo-form-Rrsqsh"></div>
</div>
</div>
</div>
</div>

Answer 1

If you want the text and the red box on the right to form a column, then they both need to be in a flexbox with flex-direction: column;.
I created a sample from scratch because there is a lot of superfluous stuff in your JSFiddle.
.group {
display: flex;
flex-direction: row;
width: 100%;
}
.content-box {
display: flex;
flex-direction: column;
justify-content: center;
align-content: center;
padding: 40px;
}
.left {
background-color: blue;
}
.right {
flex-grow: 1;
display: flex;
flex-direction: column;
}
.top-right {
background-color: green;
}
.bottom-right {
background-color: red;
}
<div class='group'>
<div class='left content-box'>
Content
</div>
<div class='right'>
<div class='top-right content-box'>
Content
</div>
<div class='bottom-right content-box'>
Content
</div>
</div>
</div>

Answer 2

https://www.w3schools.com/cssref/css3_pr_flex-direction.asp
display: flex;
flex-direction: column;