.about-container {
  width: 800px;
  margin: auto;
}

p.costum {
  font-size: 1em;
  line-height: 1.75em;
  border-top: 3px solid;
  border-image: linear-gradient(to right, #ffffff 0%, #4ab1f1 100%);
  border-image-slice: 1;
  border-width: 3px;
  margin: 0;
  padding: 40px;
  counter-increment: section;
  position: relative;
  color: rgb(255, 255, 255);
}

p.costum:before {
  content: "M" counter(section);
  position: absolute;
  border-radius: 50%;
  padding: 10px;
  height: 1.25em;
  width: auto;
  background-color: #666;
  text-align: center;
  line-height: 1.25em;
  color: white;
  font-size: 1em;
}

p.costum:nth-child(odd) {
  border-right: 3px solid;
  padding-left: 0;
  
  &:before {
    left: 100%; 
    margin-left: -20px;
  }
}

p.costum:nth-child(even) {
  border-left: 3px solid;
  padding-right: 0;
  
  &:before {
    right: 100%; 
    margin-right: -20px;
  }
}

p.costum:first-child {
  border-top: 0;
  border-top-right-radius:0;
  border-top-left-radius:0;
}
p.costum:last-child {
  border-bottom-right-radius:0;
  border-bottom-left-radius:0;
}