title: Streamlit- Remove gridlines from Area Chart
body: <p>I have the below code snippet:</p>
  <pre class="lang-py prettyprint-override"><code>df_yfinance_open = df_yfinance[&quot;Open&quot;]
  
  selector = alt.selection_single(
      fields=[&quot;symbol&quot;], empty=&quot;all&quot;, init={&quot;symbol&quot;: &quot;Open&quot;}, bind=&quot;legend&quot;
  )
  
  chart1 = (
      alt.Chart(df_yfinance_open.reset_index())
      .mark_area(
          line={&quot;color&quot;: &quot;skyblue&quot;},
          color=alt.Gradient(
              gradient=&quot;linear&quot;,
              stops=[
                  alt.GradientStop(color=&quot;white&quot;, offset=0),
                  alt.GradientStop(color=&quot;skyblue&quot;, offset=1),
              ],
              x1=1,
              x2=1,
              y1=1,
              y2=0,
          ),
      )
      .encode(x=&quot;Date&quot;, y=&quot;Open&quot;, tooltip=[&quot;Date&quot;, &quot;Open&quot;])
      .add_selection(selector)
  )
  
  st.altair_chart(chart1, use_container_width=True)
  </code></pre>
  <p>This gives me this graph:</p>
  <p><img src="https://i.stack.imgur.com/f0qPz.png" alt="graph with grid lines" /></p>
  <p>How do I remove the gridlines from the area plot?</p>