slack.css

body {
  background-color: rgb(255, 255, 255);
  font: 400 1em/1.38 Helvetica;
  color: rgb(0, 0, 0);
  margin: 0;
}

h2 {
    margin-top: 1.5em;
}

.element {
  position: relative;
  float: left;
}

.text {
  float: left;
}

.text-4 p {
  margin-bottom: 1em;
}

.wrapper {
  width: 640px;
  height: 289px;
  margin: 30px auto 0;
  overflow: hidden;
}

.element-1 {
  z-index: 1;
  width: 100%;
  height: 92px;
  background-color: rgb(25, 110, 180);
}

.element-2 {
  clear: both;
  z-index: 5;
  width: 5.4166666666%;
  height: 65px;
  margin: -80px 0 0 28.33073%;
  background: url('logo.png') rgba(222, 222, 222, 0);
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center center;
}

.element-3 {
  z-index: 4;
  width: 19.4166666666%;
  height: 60px;
  margin: -75px 0 0 54.41276%;
  background: url('slack-logo.svg') rgba(222, 222, 222, 0);
  background-repeat: no-repeat;
  background-size: 288px 120px;
  background-position: center center;
}

.text-1 {
  width: 9.9166666666%;
  min-height: 76px;
  margin: -94px 0 0 37.75%;
  font-family: Roboto;
  font-size: 2.813em;
  font-weight: 700;
  color: rgb(255, 255, 255);
}

.text-2 {
  position: relative;
  z-index: 2;
  margin: -80px 0 0 35.91276%;
  font: Roboto;
  font-size: 3.125em;
  color: rgb(255, 255, 255);
}

.text-3 {
  position: relative;
  z-index: 3;
  margin: -66px 0 0 49.7513%;
  font-family: Roboto;
  font-size: 1.875em;
  color: rgb(255, 255, 255);
}

.text-4 {
  clear: both;
  width: 53.3333333333%;
  min-height: 100px;
  margin: 35px 0 0 23.33203%;
  font-size: 1em;
  color: rgb(0, 0, 0);
}

.warning {
  clear: both;
  margin: 10px 10px 10px 10px;
  font-size: .9em;
  background: rgba(248, 243, 138, 0.23);
  border: solid 1px #e0e23a;
  padding: 1em;
  padding-top: 0;
  padding-bottom: 0;
}

.message {
  display: none;
  clear: both;
  width: 53.3333333333%;
  margin: 10px 0 0 23.33203%;
  font-size: 1em;
  background: #1df0a30b;
  border: solid 1px #148f56;
  padding: 1em;
  padding-top: 0;
  padding-bottom: 0;
}