<div class="gg-shape-triangle"></div>
<!-- Triangle from css.gg -->

body {
  background-image: linear-gradient(to top, #242a3b 0%, #1e2331 100%);
  height: 100vh;
  overflow: hidden;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  --ggs:6;
}
.gg-shape-triangle {
    position: relative;
    transform: scale(var(--ggs,1));
    width: 22px;
    height: 17px;
    border-left: 3px solid transparent;
    border-bottom: 3px solid
}
.gg-shape-triangle,
.gg-shape-triangle::before {
    display: block;
    box-sizing: border-box;
    border-right: 3px solid transparent
}
.gg-shape-triangle::before {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    border-left: 3px solid;
    border-top: 3px solid;
    border-bottom: 3px solid transparent;
    transform: rotate(45deg) skew(10deg,10deg);
    left: -2px;
    bottom: -13px
}