Aligning st.components.v1.iframe

Try something like this.

import streamlit as st
import streamlit.components.v1 as components


st.set_page_config(layout='wide')

st.markdown('<center><h2>Sample iframes</h2></center>', unsafe_allow_html=True)

cols = st.columns([1, 1, 1, 1, 1, 1])

with cols[2]:
    link1 = "https://docs.streamlit.io/en/latest"
    components.iframe(link1, width=600, height=2000, scrolling=True)