@import url("https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;600;700&display=swap");

:root {
  --white: #fff;
  --black: #1c2b2d;
  --blue: #31326f;
  --light-blue: #005490;
  --color-primary: #9d0191;
  --color-sec: #db6400;
  --grey: #eee;
  --dark-grey: #222831;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 10px;
}

body {
  font-family: "Open Sans", sans-serif;
}

p {
  font-size: 1.6rem;
  line-height: 1.5;
}

img {
  width: 100%;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Start Here */
.intro {
  background-color: var(--dark-grey);
  color: var(--white);
  padding: 2rem 0;
}

.container {
  max-width: 1200;
  text-align: center;
}

.intro h1 {
  font-size: 2.5rem;
}

.timeline {
  width: 100%;
  overflow: hidden;
}

.timeline ul {
  background: var(--grey);
  padding: 5rem 0;

}

/* Line */
.timeline ul li {
  list-style: none;
  position: relative;
  width: 6px;
  margin: 0 auto;
  padding-top: 5rem;
  background: var(--color-sec);
}

.timeline ul li::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: inherit;
  border: 1px solid var(--color-sec);
}

/* Content Box */
.timeline ul li div {
  width: 40rem;
  font-size: 1.2rem;
  position: relative;
  bottom: 0;
  padding: 1.5rem;
  background: var(--white);
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

/* Triangle */
.timeline ul li div::before {
  content: "";
  position: absolute;
  bottom: 7px;
  width: 0;
  height: 0;
  border-style: solid;
}

.timeline ul li:nth-child(odd) div {
  left: 45px;
}
.timeline ul li:nth-child(odd) div::before {
  left: -15px;
  border-width: 8px 16px 8px 0;
  border-color: transparent var(--color-primary) transparent;
}
.timeline ul li:nth-child(even) div {
  left: -439px;
}
.timeline ul li:nth-child(even) div::before {
  right: -15px;
  border-width: 8px 0px 8px 16px;
  border-color: transparent transparent transparent var(--color-sec);
}

time {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline ul li::after {
  transition: all 0.5s ease-in-out;
}

.timeline ul li.slide-in::after {
  background: var(--white);
  border: 3px solid var(--color-sec);
}

/* Hide Timeline box initially */
.timeline ul li div {
  visibility: hidden;
  opacity: 0;
  transition: all 0.5s ease-in-out;
}

.timeline ul li:nth-child(odd) div {
  transform: translateX(20rem);
}

.timeline ul li:nth-child(even) div {
  transform: translateX(-20rem);
}

.timeline ul li.slide-in div {
  transform: none;
  visibility: visible;
  opacity: 1;
}

/* Tablet */
@media screen and (max-width: 900px) {
  .timeline ul li div {
    width: 25rem;
  }

  .timeline ul li:nth-child(even) div {
    left: -289px;
  }
}


/* Mobile */
@media screen and (max-width: 600px) {
  .timeline ul li {
    margin-left: 2rem;
  }
  .timeline ul li div{
    width: calc(100vw-91px);
  }

  .timeline ul li:nth-child(even) div {
    left: 45px;
  }

  .timeline ul li:nth-child(even) div::before {
    left: -15px;
    border-width: 8px 16px 8px 0;
    border-color: transparent var(--color-sec) transparent transparent;
  }

}