* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
body {
    font-family: Arial, Helvetica, sans-serif;
  }
  
  .timeline {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
  }
  
  .timeline::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 6px;
    background: #fff;
    left: 50%;
    margin-left: -3px;
  }
  
  .container-activity {
    padding: 10px 40px;
    position: relative;
    width: 50%;
  }
  
  .container-activity::after {
    content: '';
    position: absolute;
    top: 15px;
    right: -17px;
    width: 25px;
    height: 25px;
    background: #fff;
    border-radius: 50%;
    border: 4px solid #ff9f55;
  }
  
  .left {
    left: 0;
  }
  
  .right {
    left: 50%;
  }
  
  .right::after {
    left: -16px;
  }
  
  .left::before {
    content: '';
    height: 0px;
    width: 0px;
    position: absolute;
    top: 22px;
    right: 30px;
    border: 10px solid #fff;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent #fff;
  }
  
  .right::before {
    content: '';
    height: 0px;
    width: 0px;
    position: absolute;
    top: 22px;
    left: 30px;
    border: 10px solid #fff;
    border-width: 10px 10px 10px 0;
    border-color: transparent #fff transparent transparent;
  }
  
  .activitycontact {
    padding: 20px 30px;
    background-color: hsla(0, 0%, 100%, 0.1);
    border-radius: 6px;
  }

  /* Mobile version */
  @media screen and (max-width: 600px) {
    .timeline::after {
      left: 31px;
    }
  
    .container-activity {
      width: 100%;
      padding-left: 70px;
      padding-right: 25px;
    }
  
    .container-activity::before {
      left: 60px;
      border-width: 10px 10px 10px 0;
      border-color: transparent #fff transparent transparent;
    }
  
    .left::after, .right::after {
      left: 15px;
      z-index: 1;
    }
  
    .right {
      left: 0;
    }
  }