I hope you are looking for this kind of result, please let me know if this solution make sense.
<!DOCTYPE html>
<html>
<head>
<style>
* {
box-sizing: border-box;
}
.header, .footer {
background-color: grey;
color: white;
padding: 15px;
}
.column {
float: left;
padding: 15px;
}
.clearfix::after {
content: "";
clear: both;
display: table;
}
.menu {
width: 25%;
}
.content {
width: 75%;
}
.menu ul {
list-style-type: none;
margin: 0;
padding: 0;
}
.menu li {
padding: 8px;
margin-bottom: 8px;
background-color: #33b5e5;
color: #ffffff;
}
.menu li:hover {
background-color: #0099cc;
}
.containerMenu {
display:flex;
}
.containerMenu #m1
{
order:1;
margin-right:20px;
}
.containerMenu #m3
{
order:2;
margin-right:20px;
}
.containerMenu #txt {
order: 3;
padding: 8px;
margin-bottom: 8px;
}
</style>
</head>
<body>
<div class="header">
</div>
<div class="clearfix">
<div class="column menu">
<ul class="containerMenu">
<Strong id="txt"> Test text appear </strong>
<li id="m1">Part1</li>
<li id="m3">Part 3</li>
</ul>
</div>
</div>
<div class="footer">
<p>Welcome</p>
</div>
</body>
</html>
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