Графические элементы в html

.line {
  display: inline-block;
  padding: 5px;
  background-color: powderblue;
  height: 20px;
  line-height: 20px;
  position: relative;
}
.line:after {
  content: '';
  position: absolute;
  left: 100%;
  top: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 30px 20px 0 0;
  border-color: powderblue transparent transparent transparent;
}
ul {
  background-color: powderblue;
  display: inline-block;
  height: 110px;
  position: relative;
}
ul:after {
  content: '';
  position: absolute;
  left: 100%;
  top: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 110px 30px 0 0;
  border-color: powderblue transparent transparent transparent;
}
li {
  padding: 5px;
}
.block {
  width: 200px;
  height: 150px;
  border: 1px solid black;
  text-align: center;
  position: relative;
  background: -webkit-linear-gradient(top, grey 0%, grey 50%, white 50%, white 100%);
  background: linear-gradient(to bottom, grey 0%, grey 50%, white 50%, white 100%);
}
.block:after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  width: 100px;
  height: 100px;
  background-color: powderblue;
  border-radius: 50%;
}
.number {
  line-height: 150px;
  position: relative;
  font-size: 21px;
  z-index: 2;
}