searxng/searx/templates/simple/page_with_header.html

{%- set body_class = "page_with_header" -%}
{%- extends "simple/base.html" -%}
{%- block header -%}
  <a href="{{ url_for('index') }}">{{- '' -}}
    <img class="logo" src="{{ url_for('custom', custom_file='logo', filename='img/searxng.png') }}" alt="SearXNG">{{- '' -}}
  </a>{{- '' -}}
{%- endblock -%}