.elementor-3742 .elementor-element.elementor-element-d35267f{--display:flex;--min-height:400px;--flex-direction:row;--container-widget-width:calc( ( 1 - var( --container-widget-flex-grow ) ) * 100% );--container-widget-height:100%;--container-widget-flex-grow:1;--container-widget-align-self:stretch;--flex-wrap-mobile:wrap;--align-items:stretch;--gap:10px 10px;--row-gap:10px;--column-gap:10px;}.elementor-3742 .elementor-element.elementor-element-d35267f:not(.elementor-motion-effects-element-type-background), .elementor-3742 .elementor-element.elementor-element-d35267f > .elementor-motion-effects-container > .elementor-motion-effects-layer{background-color:#FFFFFF00;}.elementor-3742 .elementor-element.elementor-element-457fe4f{--display:flex;border-style:solid;--border-style:solid;}.elementor-3742 .elementor-element.elementor-element-457fe4f:not(.elementor-motion-effects-element-type-background), .elementor-3742 .elementor-element.elementor-element-457fe4f > .elementor-motion-effects-container > .elementor-motion-effects-layer{background-color:#FFFFFF;}.elementor-3742 .elementor-element.elementor-element-f22566e .elementor-button{background-color:var( --e-global-color-primary );font-family:"DM Sans", Sans-serif;font-weight:400;text-transform:uppercase;fill:var( --e-global-color-secondary );color:var( --e-global-color-secondary );}.elementor-3742 .elementor-element.elementor-element-f22566e .elementor-button:hover, .elementor-3742 .elementor-element.elementor-element-f22566e .elementor-button:focus{background-color:var( --e-global-color-primary );color:var( --e-global-color-secondary );}.elementor-3742 .elementor-element.elementor-element-f22566e .elementor-button:hover svg, .elementor-3742 .elementor-element.elementor-element-f22566e .elementor-button:focus svg{fill:var( --e-global-color-secondary );}.elementor-3742 .elementor-element.elementor-element-1981943 > .elementor-container > .elementor-column > .elementor-widget-wrap{align-content:center;align-items:center;}.elementor-3742 .elementor-element.elementor-element-1981943:not(.elementor-motion-effects-element-type-background), .elementor-3742 .elementor-element.elementor-element-1981943 > .elementor-motion-effects-container > .elementor-motion-effects-layer{background-color:#FFFFFF00;}.elementor-3742 .elementor-element.elementor-element-1981943 > .elementor-container{min-height:65px;}.elementor-3742 .elementor-element.elementor-element-1981943{transition:background 0.3s, border 0.3s, border-radius 0.3s, box-shadow 0.3s;margin-top:0px;margin-bottom:0px;padding:0px 10px 0px 10px;z-index:150;}.elementor-3742 .elementor-element.elementor-element-1981943 > .elementor-background-overlay{transition:background 0.3s, border-radius 0.3s, opacity 0.3s;}.elementor-3742 .elementor-element.elementor-element-c1d8c24 > .elementor-element-populated{padding:0px 0px 0px 0px;}.elementor-3742 .elementor-element.elementor-element-4d42400{text-align:start;}.elementor-3742 .elementor-element.elementor-element-4d42400 img{width:20%;}.elementor-theme-builder-content-area{height:400px;}.elementor-location-header:before, .elementor-location-footer:before{content:"";display:table;clear:both;}@media(max-width:1024px){.elementor-3742 .elementor-element.elementor-element-1981943{padding:20px 20px 20px 20px;}}@media(max-width:767px){.elementor-3742 .elementor-element.elementor-element-d35267f{--min-height:40px;--justify-content:center;--align-items:center;--container-widget-width:calc( ( 1 - var( --container-widget-flex-grow ) ) * 100% );--gap:0px 0px;--row-gap:0px;--column-gap:0px;--border-radius:0px 0px 0px 0px;--padding-top:10px;--padding-bottom:20px;--padding-left:0px;--padding-right:0px;--z-index:999;}.elementor-3742 .elementor-element.elementor-element-457fe4f{--width:88%;--min-height:40px;--flex-direction:row;--container-widget-width:calc( ( 1 - var( --container-widget-flex-grow ) ) * 100% );--container-widget-height:100%;--container-widget-flex-grow:1;--container-widget-align-self:stretch;--flex-wrap-mobile:wrap;--justify-content:space-around;--align-items:center;border-width:1px 1px 1px 1px;--border-top-width:1px;--border-right-width:1px;--border-bottom-width:1px;--border-left-width:1px;--border-radius:15px 15px 15px 15px;--margin-top:0px;--margin-bottom:0px;--margin-left:0px;--margin-right:0px;--padding-top:0px;--padding-bottom:0px;--padding-left:0px;--padding-right:0px;}.elementor-3742 .elementor-element.elementor-element-f22566e .elementor-button{border-radius:15px 15px 15px 15px;padding:05px 10px 5px 10px;}.elementor-3742 .elementor-element.elementor-element-1981943 > .elementor-container{min-height:60px;}.elementor-3742 .elementor-element.elementor-element-1981943, .elementor-3742 .elementor-element.elementor-element-1981943 > .elementor-background-overlay{border-radius:0px 0px 0px 0px;}.elementor-3742 .elementor-element.elementor-element-1981943{padding:0px 15px 0px 15px;}.elementor-3742 .elementor-element.elementor-element-c1d8c24{width:100%;}.elementor-3742 .elementor-element.elementor-element-4d42400{text-align:start;}.elementor-3742 .elementor-element.elementor-element-4d42400 img{width:20%;}}/* Start custom CSS for container, class: .elementor-element-d35267f */.elementor-3742 .elementor-element.elementor-element-d35267f {
position: fixed;
bottom: 0;
width: 100vw
}

Este vas a pegar en el CSS de tu theme.

/* defaults: desk 20px, mobile 6px */
.joinchat {
–bottom: 80px;
}/* End custom CSS */