cleaner slack

inject.js

var cssText = `.p-workspace-layout {                                      
    height: 100% !important;                                              
    top: 0px !important;                                                  
    position: absolute !important;                                        
    left: 0px !important;                                                 
    right: 0px !important;
    grid-template-rows: 0px auto !important;                                                
} 
.p-workspace__primary_view {
    max-height: unset !important;
}
.p-top_nav,
.p-huddle_sidebar_footer,
.p-channel_sidebar__compose_button,                                       
.p-classic_nav__model__title__info__pins,                                 
.p-ia__view_header__button_text                                           
{                                                                         
    display: none !important;                                             
}
.p-tiles__container--has_primary_tile .p-tiles__tile {
  margin: 0px;
  border-radius: 0px;
}
`                                                                         
var css = document.createElement("style");                                
css.type = "text/css";                                                    
css.textContent = cssText;                                                

setTimeout(() => { document.body.appendChild(css); }, 10000);