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With position:fixed
you could place something fixed, keep in mind that you also have to set the position of the parent element. Css should be like this:
.main-layout {
position: relative;
}
.el-menu-layout {
position: fixed;
background: grey !important;
left: 0;
margin-top: 60px;
}
.el-header {
position: fixed;
background-color: white;
height: 12%;
top: 0;
left: 0;
right: 0;
}
.main-container {
margin-top:60px;
margin-left: 100px;
}
Source:stackexchange.com