#todo-o-conteudo {
    display: none;
    height: 100%;
}

#loader {
    width: 100%;
    height: 100%;
    background-color: #000000;
    position: fixed;
    z-index: 4;
}
    
#loader1 {
display: block;
position: absolute;
top: 50%;
left: 50%;
margin-right: -50%;
transform: translate(-50%, -50%);
z-index: 1;
background-size: 100px;
margin: 0 auto;
padding: 0;
width: 8em;
height: 8em;
border: 0px solid;
background-position: center center;
background-color: transparent;
background-size: contain;
-webkit-background-size: contain;
-moz-background-size: contain;
-o-background-size: contain;
opacity: 1;
background: #000000 url(//images.impresa.pt/expresso/2019-10-03-loading2.gif/original);
background-repeat: no-repeat;
background-position: center center;
background-size: contain;

}