diff --git a/src/app.rs b/src/app.rs
index ec8e475..9fa48cd 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -8,7 +8,7 @@ use crate::{
     ui::{self, Confirm, Help, Icon, Input, InputList, SelectCondition, Theme},
 };
 use anyhow::{anyhow, Result};
-use crossterm::event::{self, Event, KeyCode, KeyEvent, KeyModifiers};
+use ratatui::crossterm::event::{self, Event, KeyCode, KeyEvent, KeyModifiers};
 use ratatui::{
     layout::{Alignment, Constraint, Layout, Rect},
     widgets::{Block, Gauge, Padding, Paragraph},
diff --git a/src/models/search.rs b/src/models/search.rs
index 26183ad..11747f1 100644
--- a/src/models/search.rs
+++ b/src/models/search.rs
@@ -123,7 +123,11 @@ impl Search {
                             None
                         } else {
                             let before = if let Some(before) = config.before_context {
-                                let start = if index < before { 0 } else { index - before };
+                                let start = if index < before {
+                                    0
+                                } else {
+                                    index.saturating_sub(before)
+                                };
                                 slice[start..index]
                                     .iter()
                                     .enumerate()
diff --git a/src/ui/confirm.rs b/src/ui/confirm.rs
index 77f52ba..e4354dd 100644
--- a/src/ui/confirm.rs
+++ b/src/ui/confirm.rs
@@ -1,7 +1,7 @@
 use super::Theme;
 use crate::ui;
 use anyhow::Result;
-use crossterm::event::{Event, KeyCode, KeyEvent};
+use ratatui::crossterm::event::{Event, KeyCode, KeyEvent};
 use ratatui::{
     layout::{Constraint, Layout, Rect},
     widgets::{Block, Clear, Padding, Paragraph},
diff --git a/src/ui/input.rs b/src/ui/input.rs
index 003d4e8..5717281 100644
--- a/src/ui/input.rs
+++ b/src/ui/input.rs
@@ -1,6 +1,6 @@
 use super::Theme;
 use crate::{models, ui};
-use crossterm::event::{Event, KeyCode, KeyEvent};
+use ratatui::crossterm::event::{Event, KeyCode, KeyEvent};
 use ratatui::{
     layout::Rect,
     widgets::{Block, Padding, Paragraph},
diff --git a/src/ui/input_list.rs b/src/ui/input_list.rs
index 84de5fa..daa0b81 100644
--- a/src/ui/input_list.rs
+++ b/src/ui/input_list.rs
@@ -1,7 +1,7 @@
 use super::{Icon, Input, MatchColors, Theme};
 use crate::{models::SearchCondition, ui};
-use crossterm::event::{Event, KeyCode, KeyEvent};
 use itertools::Itertools;
+use ratatui::crossterm::event::{Event, KeyCode, KeyEvent};
 use ratatui::{
     layout::{Constraint, Layout, Rect},
     style::{Modifier, Style},
diff --git a/src/ui/search_condition.rs b/src/ui/search_condition.rs
index 61f86ef..13fb5c5 100644
--- a/src/ui/search_condition.rs
+++ b/src/ui/search_condition.rs
@@ -31,7 +31,7 @@ impl<'a> SearchCondition<'a> {
     }
 }
 
-impl<'a> Display for SearchCondition<'a> {
+impl Display for SearchCondition<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         let s = match &self.condition {
             models::SearchCondition::Exact(s) => format!("{} {}", self.icon.search(), s),
diff --git a/src/ui/search_result.rs b/src/ui/search_result.rs
index 2d64b25..af948ac 100644
--- a/src/ui/search_result.rs
+++ b/src/ui/search_result.rs
@@ -2,8 +2,8 @@ use super::{MatchColors, Theme};
 use crate::models::file_result::LineResult;
 use crate::models::{self, MatchResult, SearchResultConfig};
 use crate::ui;
-use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
 use nom::ToUsize;
+use ratatui::crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
 use ratatui::style::{Modifier, Style};
 use ratatui::widgets::{Block, Padding, Paragraph};
 use ratatui::{
diff --git a/src/ui/select_contidion.rs b/src/ui/select_contidion.rs
index b57dae9..1721da3 100644
--- a/src/ui/select_contidion.rs
+++ b/src/ui/select_contidion.rs
@@ -1,5 +1,5 @@
 use crate::{models::SearchCondition, ui};
-use crossterm::event::{Event, KeyCode, KeyEvent};
+use ratatui::crossterm::event::{Event, KeyCode, KeyEvent};
 use ratatui::{
     layout::{Constraint, Layout, Rect},
     text::{Line, Span},