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)