:root{
  --primary-color:#425b84;
  --secondary-color:#5b7bb4;
  --max-width: 1100px;
}
*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
.tucker-face {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  margin-right: 10px;
}
body{
  font: normal 1rem/1.5 'Ariel', sans-serif;
  background: var(--primary-color);
  color: #fff;
  overflow-x:hidden;
  overflow-y: visible;
  padding-bottom: 50px;
}
#main-header{
  background: var(--secondary-color);
  padding: 4rem 0;
}
.container{
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}
h1{
  font-size: 2.3rem;
}

#timeline ul{
  background: var(--primary-color);
  padding: 50px 0;
}
/* create line */
#timeline ul li{
list-style: none;
position: relative;
width: 6px;
margin: 0 auto;
padding-top: 50px;
background: #fff;
}
/* boxes */
#timeline ul li div{
position: relative;
bottom: 0;
width: 400px;
padding: 1rem;
background: var(--secondary-color);
transition: all 0.5s ease-in-out;
visibility: hidden;
opacity: 0;
}
/* right side */
#timeline ul li:nth-child(odd) div{
  left: 40px;
  transform: translate(200px, 0);
}
/* left side */
#timeline ul li:nth-child(even) div{
  left: -434px;
  transform: translate(-200px, 0);
}
/* dots */
#timeline ul li::after{
  content: '';
  position: absolute;
  left: 50%;
  bottom:0 ;
  width: 25px;
  height: 25px;
  background: inherit;
  transform: translatex(-50%);
  border-radius: 50%;
  transition: background 0.4s ease-in-out;
}

/* Arrows Base */
#timeline div::before{
  content: '';
  position: absolute;
  bottom: 5px;
  width: 0;
  height: 0;
  border-style:solid;
}
/* right side arrows */
#timeline ul li:nth-child(odd) div::before{
  left: -15px;
  border-width: 8px 16px 8px 0;
  border-color: transparent var(--secondary-color) transparent transparent;
}
#timeline ul li:nth-child(even) div::before{
  right: -15px;
  border-width: 8px 0 8px 16px;
  border-color: transparent  transparent transparent var(--secondary-color);
}

/* show boxes */
#timeline ul li.show div{
  transform: none;
  visibility: visible;
  opacity: 1;
}
#timeline ul li.show:after{
  background: var(--secondary-color);

}
@media(max-width: 900px){
  #timeline ul li div{
      width: 250px;
  }
  #timeline ul li:nth-child(even) div{
      left: -284px;
  }
}
@media(max-width:600px) {
  #timeline ul li {
      margin-left: 20px;
  }
  #timeline ul li div{
      width: calc(100vw - 90px);
  }
  #timeline ul li:nth-child(even) div{
      left: 40px;
  }
  #timeline ul li:nth-child(even) div::before{
      left: -15px;
      border-width: 8px 16px 8px 0;
      border-color: transparent var(--secondary-color) transparent transparent;
  }
}