How to horizontally align pseudo element with element and its container - html

Question

I've been through some CSS practice lately. Let's say I have the following HTML/CSS code of a calendar web app you can see in my Codepen.
What I need is to have the ".day_body" element and the "+" pseudo element along with its white circle container horizontally aligned. Furthermore, I need that "+" to fit in the centre of the white circle. Unfortunately editing the HTML or using flexbox is not an option for now.
Any ideas on how to accomplish that?
<div class="calendar_plan">
<div class="day_title">Today</div>
<div class="day_body">19 May 2020</div>
<div class="day_add">
<span class="plus_sign"></span>
</div>
<div>
.calendar_plan {
background-color: teal;
color: #fff;
margin-top: 2rem;
margin-bottom: 4rem;
padding: 3rem;
clear: both;
overflow: hidden;
}
.day_title {
font-size: 2.2em;
font-weight: 800;
}
.day_body {
font-size: 2em;
float: left;
}
.day_add {
margin-left: 20px;
float: left;
}
.day_add:after {
display: block;
width: 4rem;
height: 4rem;
content: "\002B";
font-size: 4rem;
color: #999;
background-color: #fff;
border-radius: 50%;
line-height: 4rem;
}
.day_add:hover:after {
cursor: pointer;
}

Answer 1

Like already mentioned in the comment, adding text-align: center; to .day-add helps to align the plus sign.
To horizontally align the the date with the circle, you could increase the line-height of the .day_body to the half of the line-height of the circle (4em): line-height: 2em;. Nevertheless this moves the date a little bit 'down'. Is that fine?
Alternatively you could use absolute positioning of the circle.
.calendar_plan {
background-color: teal;
color: #fff;
margin-top: 2rem;
margin-bottom: 4rem;
padding: 3rem;
clear: both;
overflow: hidden;
}
.day_title {
font-size: 2.2em;
font-weight: 800;
}
.day_body {
font-size: 2em;
float: left;
line-height: 2em;
}
.day_add {
margin-left: 20px;
float: left;
text-align: center;
}
.day_add:after {
display: block;
width: 4rem;
height: 4rem;
content: "\002B";
font-size: 4rem;
color: #999;
background-color: #fff;
border-radius: 50%;
line-height: 4rem;
}
.day_add:hover:after {
cursor: pointer;
}
<div class="calendar_plan">
<div class="day_title">Today</div>
<div class="day_body">19 May 2020</div>
<div class="day_add">
<span class="plus_sign"></span>
</div>
<div>