Franky83,
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
.main{
position:relative;
width:600px;
padding:10px 0;
background-color:#f35800;
}
.dd{
display:flex;
position:relative;
margin:10px;
}
.d{
flex-grow:1;
}
.textField{
padding:0 20px;
}
</style>
</head>
<body>
<div class="main">
<div class="dd">
<span class="textField">Subject: </span><input type="text" class="d">
</div>
<div class="dd">
<span class="textField">From: </span><input type="text" class="d">
</div>
<div class="dd">
<span class="textField">To: </span><input type="text" class="d">
</div>
</div>
</body>
</html>