diff --git a/README-VIM.md b/README-VIM.md
index 88a9308..a42801d 100644
--- a/README-VIM.md
+++ b/README-VIM.md
@@ -204,7 +204,7 @@ following options are allowed:
     - `yoffset` [float default 0.5 range [0 ~ 1]]
     - `xoffset` [float default 0.5 range [0 ~ 1]]
     - `highlight` [string default `'Comment'`]: Highlight group for border
-    - `rounded` [boolean default `v:true`]: Use rounded border
+    - `border` [string default `rounded`]: Border style (`rounded` | `sharp` | `horizontal`)
 
 `fzf#wrap`
 ----------
@@ -300,7 +300,7 @@ The latest versions of Vim and Neovim include builtin terminal emulator
 " - xoffset [float default 0.0 range [0 ~ 1]]
 " - yoffset [float default 0.0 range [0 ~ 1]]
 " - highlight [string default 'Comment']: Highlight group for border
-" - rounded [boolean default v:true]: Use rounded border
+" - border [string default 'rounded']: Border style ('rounded' | 'sharp' | 'horizontal')
 let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
 ```
 
diff --git a/doc/fzf.txt b/doc/fzf.txt
index 447a6be..1a58691 100644
--- a/doc/fzf.txt
+++ b/doc/fzf.txt
@@ -223,7 +223,7 @@ following options are allowed:
    - `xoffset` [float default 0.0 range [0 ~ 1]]
    - `yoffset` [float default 0.0 range [0 ~ 1]]
    - `highlight` [string default `'Comment'`]: Highlight group for border
-   - `rounded` [boolean default `v:true`]: Use rounded border
+   - `border` [string default `rounded`]: Border style (`rounded` | `sharp` | `horizontal`)
 
 
 FZF#WRAP
@@ -315,7 +315,7 @@ Starting fzf in a popup window~
     " - xoffset [float default 0.5 range [0 ~ 1]]
     " - yoffset [float default 0.5 range [0 ~ 1]]
     " - highlight [string default 'Comment']: Highlight group for border
-    " - rounded [boolean default v:true]: Use rounded border
+    " - border [string default 'rounded']: Border style ('rounded' | 'sharp' | 'horizontal')
     let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
 <
 
diff --git a/plugin/fzf.vim b/plugin/fzf.vim
index 5c93f5a..7e3046a 100644
--- a/plugin/fzf.vim
+++ b/plugin/fzf.vim
@@ -854,20 +854,33 @@ function! s:popup(opts) abort
   let row += !has('nvim')
   let col += !has('nvim')
 
-  " Border
-  let edges = get(a:opts, 'rounded', 1) ? ['╭', '╮', '╰', '╯'] : ['┌', '┐', '└', '┘']
-  let bar = repeat('─', width - 2)
-  let top = edges[0] .. bar .. edges[1]
-  let mid = '│' .. repeat(' ', width - 2) .. '│'
-  let bot = edges[2] .. bar .. edges[3]
-  let border = [top] + repeat([mid], height - 2) + [bot]
+  " Border style
+  let style = get(a:opts, 'border', 'rounded')
+  if !has_key(a:opts, 'border') && !get(a:opts, 'rounded', 1)
+    let style = 'sharp'
+  endif
+
+  if style == 'horizontal'
+    let hor = repeat('─', width)
+    let mid = repeat(' ', width)
+    let border = [hor] + repeat([mid], height - 2) + [hor]
+    let margin = 0
+  else
+    let edges = style == 'sharp' ? ['┌', '┐', '└', '┘'] : ['╭', '╮', '╰', '╯']
+    let bar = repeat('─', width - 2)
+    let top = edges[0] .. bar .. edges[1]
+    let mid = '│' .. repeat(' ', width - 2) .. '│'
+    let bot = edges[2] .. bar .. edges[3]
+    let border = [top] + repeat([mid], height - 2) + [bot]
+    let margin = 2
+  endif
 
   let highlight = get(a:opts, 'highlight', 'Comment')
   let frame = s:create_popup(highlight, {
     \ 'row': row, 'col': col, 'width': width, 'height': height, 'border': border
   \ })
   call s:create_popup('Normal', {
-    \ 'row': row + 1, 'col': col + 2, 'width': width - 4, 'height': height - 2
+    \ 'row': row + 1, 'col': col + margin, 'width': width - margin * 2, 'height': height - 2
   \ })
   if has('nvim')
     execute 'autocmd BufWipeout <buffer> bwipeout '..frame