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HTML

            
              <div class="group group1">
  <div class="demo1">to top</div>
  <div class="demo2">to right</div>
  <div class="demo3">to bottom</div>
  <div class="demo4">to left</div>
  <br>
  <div class="demo9">0deg</div>
  <div class="demo10">90deg</div>
  <div class="demo11">180deg</div>
  <div class="demo12">270deg</div>
  <br>
  <div class="demo5">to top right</div>
  <div class="demo6">to bottom right</div>
  <div class="demo7">to bottom left</div>
  <div class="demo8">to top left</div>
  <br>
  <div class="demo13">45deg</div>
  <div class="demo14">135deg</div>
  <div class="demo15">225deg</div>
  <div class="demo16">315deg</div>
</div>
<div class="group group2">
  <div class="demo1">BLACK</div>
  <div class="demo2">#000000</div>
  <div class="demo3">RGBA</div>
  <div class="demo4">HSLA</div>
  <br>
  <div class="demo5">RED</div>
  <div class="demo6">RED</div>
  <div class="demo7">RED</div>
  <div class="demo8">RED</div>
  <br>
  <div class="demo9">GREEN</div>
  <div class="demo10">GREEN</div>
  <div class="demo11">GREEN</div>
  <div class="demo12">GREEN</div>
  <br>
  <div class="demo13">BLUE</div>
  <div class="demo14">BLUE</div>
  <div class="demo15">BLUE</div>
  <div class="demo16">BLUE</div>
</div>
!

CSS

            
              body, html
  margin: 0
  padding: 0
  text-align: center
  font-size: 0

.group
  display: inline-block
  background-color: #999
  border: 1px solid #333
  margin: 10px
  div 
    display: inline-block
    width: 100px
    height: 100px
    font-size: 10px
    line-height: 100px
    text-shadow: 1px 0 0 #fff, -1px 0 0 #fff, 0 -1px 0 #fff,0 1px 0 #fff
    &:nth-child(n + 5)
      margin-top: 10px
    &+div
      margin-left: 10px

$start = white
$startRGBA = rgba(255,255,255,1)
$end = black
$endSL = #000
$endRGBA = rgba(0,0,0,1)
$endHSLA = hsla(0,0,0,1)

.group1 
  .demo1
    background-image: linear-gradient(to top, $start, $end)
  .demo2
    background-image: linear-gradient(to right, $start, $end)
  .demo3
    background-image: linear-gradient(to bottom, $start, $end)
  .demo4
    background-image: linear-gradient(to left, $start, $end)
  .demo5
    background-image: linear-gradient(to top right, $start, $end)
  .demo6
    background-image: linear-gradient(to bottom right, $start, $end)
  .demo7
    background-image: linear-gradient(to bottom left, $start, $end)
  .demo8
    background-image: linear-gradient(to top left, $start, $end)
  .demo9
    background-image: linear-gradient(0deg, $start, $end)
  .demo10
    background-image: linear-gradient(90deg, $start, $end)
  .demo11
    background-image: linear-gradient(180deg, $start, $end)
  .demo12
    background-image: linear-gradient(270deg, $start, $end)
  .demo13
    background-image: linear-gradient(45deg, $start, $end)
  .demo14
    background-image: linear-gradient(135deg, $start, $end)
  .demo15
    background-image: linear-gradient(225deg, $start, $end)
  .demo16
    background-image: linear-gradient(315deg, $start, $end)

.group2 
  .demo1
    background-image: linear-gradient(90deg, transparent 40%, $end 60%)
  .demo2
    background-image: linear-gradient(90deg, #fff 40%, $endSL 60%)
  .demo3
    background-image: linear-gradient(90deg,rgba(0, 0, 0, 0) 40%,$endRGBA 60%)
  .demo4
    background-image: linear-gradient(90deg,hsla(0, 0, 0, 0) 40%,$endHSLA 60%)
  .demo5
    background-image: linear-gradient(90deg, red 40%, $end 60%)
  .demo6
    background-image: linear-gradient(90deg, #ff0000 40%, $endSL 60%)
  .demo7
    background-image: linear-gradient(90deg,rgba(255, 0, 0, 0) 40%,$endRGBA 60%)
  .demo8
    background-image: linear-gradient(90deg,hsla(0, 100%, 50%, 0) 40%,$endHSLA 60%)
  .demo9
    background-image: linear-gradient(90deg,lime 40px,$end 60px)
  .demo10
    background-image: linear-gradient(90deg, #00ff00 40px, $endSL 60px)
  .demo11
    background-image: linear-gradient(90deg,rgba(0, 255, 0, 0) 40px,$endRGBA 60px)
  .demo12
    background-image: linear-gradient(90deg,hsla(120, 100%, 50%, 0) 40px,$endHSLA 60px)
  .demo13
    background-image: linear-gradient(90deg,blue 40px,$end 60%)
  .demo14
    background-image: linear-gradient(90deg, #0000ff 40px, $endSL 60%)
  .demo15
    background-image: linear-gradient(90deg,rgba(0, 0, 255, 0) 40px,$endRGBA 60%)
  .demo16
    background-image: linear-gradient(90deg,hsla(240, 100%, 50%, 0) 40px,$endHSLA 60%)
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