<style>
#container{
position:relative;
width:100%;
display:flex;
justify-content:space-between;
}
.sol{
width:100px;
height:100px;
background:red;
display:inline-block;
}
.sag{
width:100px;
height:100px;
background:red;
display:inline-block;
}
</style>

<div id="container">
<div class="sol">sol </div>
<div class="sag">sag </div>
</div>