border-block-end-color: black;
border-block-end-color: #0000ff;
border-block-end-color: rgb(0, 255, 0);
border-block-end-color: rgba(0, 255, 0, 0.5);
border-block-end-color: hsl(0, 100%, 50%);
border-block-end-color: hsla(0, 100%, 50%, 0.1);
border-block-end-color: transparent;