/* Variables */
:root{
  --primary-color: #425b84;
  --secondary-color: #5b7bb4;
  --max-width: 1100px;
}

/* Reset */
body{
  font: normal 1rem/1.5 'Arial', sans-serif;
  background: var(--primary-color);
  color: #fff;
  overflow-x: hidden;
  padding-bottom: 50px;
  box-sizing: border-box;
  text-rendering: optimizeLegibility;
}

*,
*::before,
*::after{
    margin: 0;
    padding: 0;
    box-sizing: inherit;
    text-rendering: inherit;
}

/* Header */
#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 */
#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;
}

/* Right Side */
#timeline ul li:nth-child(odd) div {
  left: 40px;
}

/* Left Side */
#timeline ul li:nth-child(even) div {
  left: -434px;
}

/* Dots */
#timeline ul li:after{
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 25px;
  height: 25px;
  background: var(--secondary-color);
  transform: translateX(-50%);
  border-radius: 50%;
  transition: background 0.5s 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 0px 8px 16px;
  border-color: transparent transparent  transparent 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;
  }
}