userstyle.css

/* use system fonts for faster/cleaner rendering */
body, body * {
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol" !important;
}

/* Desktop style contacts and messages width */
:root {
  /* Basic width of left column with contacts */
  --contacts-column-width: 300px;
}
.im_page_wrap {
  max-width: none;
  border-radius: 0;
  border-left: 0;
  border-right: 0;
  border-bottom: 0;
}
.tg_head_split {
  max-width: none;
}
.im_send_panel_wrap {
  max-width: none;
  padding-bottom: auto;
}
.im_dialogs_col_wrap {
  padding-bottom: auto;
}
.im_dialogs_col_wrap {
  width: var(--contacts-column-width);
}
.im_history_col_wrap {
  margin-left: var(--contacts-column-width);
  float: none;
  width: auto;
}
.im_message_wrap {
  max-width: none;
}
.im_message_wrap {
  max-width: none;
}
.im_send_form {
  max-width: none;
}
.tg_head_logo_wrap {
  width: var(--contacts-column-width);
}
.tg_head_main_wrap {
  width: auto;
  float: none;
}
/* Move stickers dialog a bit to avoid window overlapping */
.composer_emoji_tooltip_tail {
  margin-left: 57px;
}
.composer_emoji_tooltip {
  margin-left: -200px;
}
/* Hide footer */
.footer_wrap, .footer_empty {
  display: none;
}
.im_dialogs_col_wrap {
  padding-bottom: 0;
}