csslayout/styles/patterns/_fixed-at-corner.scss

.fixed-at-corner {
    width: 100%;
    height: 100%;
    border: 1px solid rgba(0, 0, 0, .3);
    border-radius: 0.25rem;

    position: relative;
}

.fixed-at-corner__corner {
    position: absolute;
}

.fixed-at-corner__corner--tl {
    left: 0;
    top: 0;
}

.fixed-at-corner__corner--tr {
    top: 0;
    right: 0;
}

.fixed-at-corner__corner--br {
    bottom: 0;
    right: 0;
}

.fixed-at-corner__corner--bl {
    bottom: 0;
    left: 0;
}