.btn-back-top{display:block;right:40px;bottom:40px;position:fixed;width:61px;height:48px;z-index:1000;opacity:0;visibility:hidden;transition:opacity 2s ease,visibility 0s linear 2s}.btn-back-top::before{content:"";display:block;position:relative;left:7px;top:12px;width:22px;height:22px;border-right:6px solid #fff;border-top:6px solid #fff;transform:rotate(-45deg);transition:all .2s ease}.btn{font-weight:400;color:#212529;text-align:center;vertical-align:middle;user-select:none;background-color:transparent;border:1px solid transparent;padding:.375rem .75rem;font-size:1rem;line-height:1.5;border-radius:.25rem;transition:color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out}.bg-teal{background-color:#20c997}.bg-teal.btn:hover{border-color:#199d76;color:#ececec}.btn-back-top.show{opacity:1;visibility:visible;transition:opacity 2s ease,visibility 0s linear 0s}.btn-back-top:not(.show){opacity:0;visibility:hidden;transition:opacity 2s ease,visibility 0s linear 2s}