<div class="select">
<select name="you_are" id="dropdown" class="selection">
<option value="0" disabled selected>Select</option>
<option value="1">Student</option>
<option value="2">Full-time Job</option>
<option value="2">Part-time Job</option>
<option value="3">Job-Seeker</option>
<option value="4">Nothing Yet</option>
</select>
</div>
Insted of styling the select why dont you add a div out-side the select.
and style then in CSS
.select{
width: 100%;
height: 45px;
position: relative;
}
.select::after{
content: '\f0d7';
position: absolute;
top: 0px;
right: 10px;
font-family: 'Font Awesome 5 Free';
font-weight: 900;
color: #0b660b;
font-size: 45px;
z-index: 2;
}
#dropdown{
-webkit-appearance: button;
-moz-appearance: button;
appearance: button;
height: 45px;
width: 100%;
outline: none;
border: none;
border-bottom: 2px solid #0b660b;
font-size: 20px;
background-color: #0b660b23;
box-sizing: border-box;
padding-left: 10px;
padding-right: 10px;
}