User CSS for GitHub: square the circular avatars, hide dashboards' “Member statuses” sidebar

tweak-github.css

/* Hide GitHub dashboards' "Member statuses" sidebar, while hopefully not
   doing too much damage to other web sites. For e.g. Safari, save this
   somewhere and select it in Preferences :: Advanced :: Style sheet. */

@media screen and (min-width: 1012px) {
body.page-responsive > div.application-main > div.d-md-flex
    div.mt-3.border-bottom
        { width: 100% !important }

body.page-responsive > div.application-main > div.d-md-flex
    aside.team-left-column.col-md-3.col-lg-4.mt-5.hide-lg.hide-md.hide-sm.border-bottom
        { display: none !important }
}

/* Restore square GitHub avatar images. */
@media screen {
body.env-production > div.application-main img.avatar-user,
body.env-production > div header img.avatar-user,
body.env-production > div header img.avatar-small,
body.env-production > div div.Header img.avatar-user,
body.env-production > div.Popover > div.Popover-message div img.avatar-user,
body.env-production div.application-main div.AvatarStack a.avatar-user
	{ border-radius: 3px !important }
}