Anwer AR

Can you please post the link of the page?

You better use Google to get your desired Dropdown Menu..

Look at your page source..
on line 20

<link
     rel="stylesheet"
     href="https://www.crabapplelane.net/WordPress/wp-       content/themes/ahimsa/style.css"
       type="text/css" media="screen"
    />

“href” and “type” are starting new lines & there may be some problem with the method you are using to call your stylesheet file…

You are using px to define header width & it will output fixed 960px width on all devices without caring of their screen resolutions.
so to fix this issue, i will suggest you to use CSS Media queries for different resolutions.
like

@media only screen and (max-width : 1200px){
  #header {width : 1100px;}
}
@media only screen and (max-width : 979px){
 #header {width : 960px;}
}

here is an info about CSS3 Media quries and you can use them to control your header width on all devices.
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Media_queries