Header Text not centering on mobile for Mojave template

Hello All, Currently trying to finish up my site but it seems as though the header text on mobile does not want to center. I can not find the reason this is happening as it is centered  everywhere else. Please feel free to let me know if anyone has come across this problem. The site is theaccomplishedbrain.com. Thank you!

@andrewamigo add to Home > Design > Custom CSS

@media screen and (max-width:640px) {
div#block-yui_3_17_2_13_1457552603071_12467 h1 {
    margin-left: 0 !important;
}
}