.container {
    border:1px dashed red;
    margin: 2em auto;
}

article {
    margin:2em 0;
}

.stickytop0 {
    background-color:pink;
    position:sticky;
    top:0;
}
.static {
    background-color:#90EE90;
    position:static;
}
.reldecal {
    background-color:#FED8B1;
    position:relative;
    right:5em;
}
.relssel{
    position:relative;
}
.ss-element {
    position:absolute;
    top:0;
    right:0;
    background-color:orange;
    padding:1em;
}
.fixed {
    background-color:#ADD8E6;
    position:fixed;
    right:0;
    top:1em;
    max-width:20%;
}