Generated by SassMeister.com.

SassMeister-input-HTML.html

<div id="logo"></div>

SassMeister-input.scss

// ----
// Sass (v3.4.13)
// Compass (v1.0.3)
// ----

@import "compass";

$brand-color:   hsl(176.5,60.7%,43.9%);
$brand-color-2: hsl(192.5,48.2%,56.9%);
$logo-stroke-width: 3rem;

html {
  font-size: 62.5%;
}

#logo {

  z-index: 1;

  top:  $logo-stroke-width * 2;
  left: $logo-stroke-width * 2;

  -webkit-animation: hue 10s infinite linear;

  @include box-shadow(0 0 0 $logo-stroke-width $brand-color);
  @include border-top-right-radius($logo-stroke-width);
  @include border-bottom-left-radius($logo-stroke-width);

  &,
  &:before,
  &:after {
    position: absolute;
    content: "";
    display: block;
  }

  &,
  &:after {
    height: 14rem;
    width: 14rem;
  }

  &:after {

    z-index: 0;
    bottom: -9rem;
    right: -9rem;

    @include border-top-right-radius($logo-stroke-width);
    @include border-bottom-left-radius($logo-stroke-width);

    @include box-shadow(
      0 0 0 $logo-stroke-width $brand-color,
      -$logo-stroke-width 0 0 $logo-stroke-width white
    );
  }

  &:before {
    top: 6rem;
    left: 17rem;
    height: $logo-stroke-width;
    width: $logo-stroke-width;
    background-color: white;
    z-index: 1;
  }
}

@-webkit-keyframes hue {
  from { -webkit-filter: hue-rotate(0deg);    }
  to   { -webkit-filter: hue-rotate(-360deg); }
}

SassMeister-output.css

html {
  font-size: 62.5%;
}

#logo {
  z-index: 1;
  top: 6rem;
  left: 6rem;
  -webkit-animation: hue 10s infinite linear;
  -moz-box-shadow: 0 0 0 3rem #2cb4ac;
  -webkit-box-shadow: 0 0 0 3rem #2cb4ac;
  box-shadow: 0 0 0 3rem #2cb4ac;
  -moz-border-radius-topright: 3rem;
  -webkit-border-top-right-radius: 3rem;
  border-top-right-radius: 3rem;
  -moz-border-radius-bottomleft: 3rem;
  -webkit-border-bottom-left-radius: 3rem;
  border-bottom-left-radius: 3rem;
}
#logo, #logo:before, #logo:after {
  position: absolute;
  content: "";
  display: block;
}
#logo, #logo:after {
  height: 14rem;
  width: 14rem;
}
#logo:after {
  z-index: 0;
  bottom: -9rem;
  right: -9rem;
  -moz-border-radius-topright: 3rem;
  -webkit-border-top-right-radius: 3rem;
  border-top-right-radius: 3rem;
  -moz-border-radius-bottomleft: 3rem;
  -webkit-border-bottom-left-radius: 3rem;
  border-bottom-left-radius: 3rem;
  -moz-box-shadow: 0 0 0 3rem #2cb4ac, -3rem 0 0 3rem white;
  -webkit-box-shadow: 0 0 0 3rem #2cb4ac, -3rem 0 0 3rem white;
  box-shadow: 0 0 0 3rem #2cb4ac, -3rem 0 0 3rem white;
}
#logo:before {
  top: 6rem;
  left: 17rem;
  height: 3rem;
  width: 3rem;
  background-color: white;
  z-index: 1;
}

@-webkit-keyframes hue {
  from {
    -webkit-filter: hue-rotate(0deg);
  }
  to {
    -webkit-filter: hue-rotate(-360deg);
  }
}

SassMeister-rendered.html

<div id="logo"></div>