Align dropdown menu with parent - html

Question

I'm not very experienced on web development and have run across some issue,i am aligning the menu but it not starting from its parent. I am searched and experimented every possible way but i cant figure out where is the problem.
Following is the css
.drop {
z-index: 9;
max-width: 361px;
padding-top: 1px;
position: absolute;
display: none;
float: left;
min-width: 200px;
margin: 22px;
padding: 1.2em 0;
font-size: 12px;
list-style: none;
background: #02709be6;
}
.com:hover .drop {
display: block;
}
li.com .drop>li ul {
align-items: center;
top: 22px;
}
.drop li {
width: 100%;
padding-left: 41px;
padding-right: 51px;
display: block;
clear: both;
padding: 1px 1.6em;
line-height: 1.8;
white-space: nowrap;
color: #333;
-webkit-transition: none;
transition: none;
}
nav {
border: 1px solid #000;
border-width: 0 0 1px;
list-style: none;
text-align: center;
font-size: 21px;
}
nav li {
display: inline-block;
padding: 21px;
padding-right: 35px;
padding-left: 35px;
border-left: 1px solid rgba(255, 255, 255, 0.1);
text-align-last: left;
}
.nav {
margin-top: 25px;
color: #000000;
text-align: left;
left: 0;
width: 960px;
height: 24px;
color: #ffffff;
}
expected result be should like this

Answer 1

Try this code:
nav li{
display: inline-block;
padding: 21px;
padding-right: 35px;
padding-left: 35px;
border-left: 1px solid rgba(255,255,255,0.1);
text-align-last: left;
position: relative;
}
.drop{
z-index: 9;
max-width: 415px;
padding-top: 1px;
display: none;
float: left;
min-width: 200px;
padding: 1.2em 0;
font-size: 12px;
list-style: none;
background: #02709be6;
position: absolute;
left: 0;
margin: 0;
top: 100%;
}
Remove this code:
li #drop-about {
left: 56vw;
max-width: 304px;
min-width: 242px; }
li #drop-dt {
left: 22.7vw;
}