Not able to float div correctly - html

Question

I have a list with 3 blocks each taking 33% normally. When I resize the window to smaller size I would like the first two blocks to be stacked one above the other and take 50% of the width while the third element to span and take the other 50% on the whole but I am only able to span first two blocks in first row and third block in 2nd row.
And on minimizing it further, I would like all of them to be stacked one below the other.
I have added the layouts:
Here is my code:
li.listChild .time-home {
float: left;
height: auto;
width: 100%;
line-height: 21px;
font-size: 12px;
font-weight: 700;
text-align: right;
}
#media only screen and (min-width: 800px) and (max-width: 1023px) {
li.listChild .time-home {
width: 100%; }
}
li.listChild .time-home .listItem {
float: left; }
li.listChild .time-home .listItem.datum-home {
width: 33%;
font-weight: 700; }
#media only screen and (min-width: 1024px) and (max-width: 1443px) {
li.listChild .time-home .listItem.datum-home {
width: 50%;
border-bottom: 1px #e8e8e8 solid; }
}
#media only screen and (min-width: 800px) and (max-width: 1023px) {
li.listChild .time-home .listItem.datum-home {
width: 100%;
border-bottom: 1px #e8e8e8 solid; }
}
li.listChild .time-home .listItem.zeit-home {
font-weight: 400;
width: 33%;
}
#media only screen and (min-width: 1024px) and (max-width: 1443px) {
li.listChild .time-home .listItem.zeit-home {
width: 50%;
border-bottom: 1px #e8e8e8 solid; }
}
#media only screen and (min-width: 800px) and (max-width: 1023px) {
li.listChild .time-home .listItem.zeit-home {
width: 100%;
border-bottom: 1px #e8e8e8 solid; }
}
li.listChild .time-home .listItem.type-home {
width: 33%;
color: #0293ed;
border: none;
font-weight: 700;
}
#media only screen and (min-width: 1024px) and (max-width: 1443px) {
li.listChild .time-home .listItem.type-home {
width: 100%;
border-bottom: 1px #e8e8e8 solid;
border-right: 1px #e8e8e8 solid; }
}
#media only screen and (min-width: 800px) and (max-width: 1023px) {
li.listChild .time-home .listItem.type-home {
width: 100%;
border-bottom: 1px #e8e8e8 solid;
border-right: 1px #e8e8e8 solid; }
}
<li class="listChild">
<div class="time">
<div class="listItem datum">
3.6.93
</div>
<div class="listItem zeit">
4.6.93
</div>
<div class="listItem type">
Thomas
</div>
</div>
</li>

Answer 1

You don't necessarily need to use flexbox, you could use absolute positioning.
Example: https://jsfiddle.net/yyuwmv1r/
* {
box-sizing: border-box;
}
.container {
height: 300px;
width: 100%;
position: relative;
}
.one,
.two,
.three {
border: 2px solid black;
height: 33.33%;
width: 100%;
float: left;
background: red;
}
.two {
background: blue;
}
.three {
background: green;
}
#media only screen and (min-width: 800px) and (max-width: 1200px) {
.one,
.two,
.three {
position: absolute;
}
.one {
top: 0;
left: 0;
height: 50%;
width: 50%;
}
.two {
top: 50%;
left: 0;
height: 50%;
width: 50%;
}
.three {
top: 0;
left: 50%;
height: 100%;
width: 50%;
}
}
#media only screen and (min-width: 1200px) {
.one,
.two,
.three {
border: 2px solid black;
height: 100%;
width: 33.33%;
float: left;
background: red;
}
.two {
background: blue;
}
.three {
background: green;
}
}
<div class="container">
<div class="one">
One
</div>
<div class="two">
Two
</div>
<div class="three">
Three
</div>
</div>

Answer 2

You can do this with Flexbox and media queries
DEMO
.div-1, .div-2, .div-3 {
border: 1px solid black;
}
.content {
display: flex;
flex-direction: row;
min-height: 100vh;
}
.group {
flex: 2;
display: flex;
}
.div-3, .div-1, .div-2 {
flex: 1;
}
#media(max-width: 992px) {
.group {
flex-direction: column;
}
}
#media(max-width: 480px) {
.content {
flex-direction: column;
}
}
<div class="content">
<div class="group">
<div class="div-1">Div 1</div>
<div class="div-2">Div 2</div>
</div>
<div class="div-3">Div 3</div>
</div>

Answer 3

Drag the output left and right to simulate media queries. Keep in mind I didn't abide by your media queries, was using my own only to simulate the example.
Fiddle here
<li class="listChild">
<div class="time">
<div class="some-container">
<div class="listItem datum">
list one
</div>
<div class="listItem zeit">
list two
</div>
</div>
<div class="listItem type">
list three
</div>
</div>
</li>
* {
box-sizing: border-box;
}
.listItem {
border: 1px solid #000;
padding: 10px;
float: left;
width: 250px;
height: 30px;
}
.some-container {
float: left;
}
.some-container + .listItem {
float: left;
}
#media (max-width: 800px) and (min-width: 300px) {
.some-container .listItem {
height: 30px;
float: none;
}
.some-container + .listItem {
height: 60px;
}
}
#media (max-width: 299px) {
.listItem {
float: none;
width: 100%;
}
}