Clouds.
<a rel="nofollow" class="external text" href="https://pixabay.com/en/users/3dman_eu-1553824/">Peggy und Marco Lachmann-Anke</a> (3dman_eu)
<a rel="nofollow" class="external free" href="https://pixabay.com/en/clouds-mountains-sky-white-2292454/">https://pixabay.com/en/clouds-mountains-sky-white-2292454/</a> <bdo lang="en" dir="ltr" title="archived on 18 January 2019 at the Wayback Machine"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20190118201428/https%3A//pixabay.com/en/clouds-mountains-sky-white-2292454/">archive copy</a></bdo>