Everything is fine without the scroll bar

Question

How I can get rid of those scroll bars

Answer 1

Here is the CSS using which you can modify the scroll bar or even get rid of.
Here is what I did to get rid of scroll bars:
CSS:

::-webkit-scrollbar {
width: 0px;
}
::-webkit-scrollbar-track {
box-shadow: inset 0 0 1px transparent;
border-radius: 20%;
}
::-webkit-scrollbar-thumb {
background: transparent;
border-radius: 20%;
}
::-webkit-scrollbar-thumb:hover {
background: transparent;
}

Answer 2

add
overflow:hidden
will do

Answer 3

Set

.nav{
position: absolute;
right: 0;
}