style.css

@import url("https://fonts.googleapis.com/css2?family=Roboto+Mono&display=swap");
@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@200&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Lato:wght@300;400;700&display=swap');

@font-face {
  font-family: 'Atlantis Inline Grunge';
  font-style: normal;
  font-weight: 400;
  src: local('Atlantis Inline Grunge'), url('https://fonts.cdnfonts.com/s/19199/AtlantisInlineGrunge.woff') format('woff');
}

* {
  padding: 0;
  margin: 0;
  font-family: "Roboto Mono";
}

html {
  font-family: "Roboto Mono";
  scroll-behavior: smooth;
  width: 100%;
}

section {
  justify-content: center;
  text-align: center !important;
}

.titles {
  padding-bottom: 50px;
}

.atlantis-symbol {
  transform: translateY(-15px);
  opacity: 80%;
}

#intro {
  height: 91vh;
  padding: 50px 10%;
  background-image: url("img/intro_img.png");
  background-color: #030c35;
  background-position-x: center;
  background-position-y: -10px;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
  z-index: 1;
}

#about, #team, #schedule, #faq, #contact, #sponsors, #speakers {
  padding: 100px 10% !important;
  z-index: 1;
}

.gradient {
  background: linear-gradient(180deg, rgba(8,17,79,1) 0%, rgba(8,112,167,1) 50%, rgba(0,52,89,1) 100%);
}

nav {
  position: sticky;
  top: 0;
  background-color: #030c35;
  z-index: 2;
}

nav .container {
  width: 90%;
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
  padding: 10px;
}

nav .container ul li {
  display: inline-block;
}

nav .container ul li a {
  display: inline-block;
  text-decoration: none;
  padding: 10px 20px;
  color: #1E97D7;
  font-size: 18px;
  transition: 0.3s ease color;
}

nav .container ul li.active a, nav .container ul li a:not(nav .container ul li button a):hover {
  transition: 0.3s ease color;
  color: #91F9E6;
  font-weight: bold;
}

#register-1 a, #register-2 a {
  color: white !important;
}

#intro-txt {
  color: white;
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

#intro-txt-1 {
  font-size: 90px;
  font-family: 'Atlantis Inline Grunge';
}

#intro-txt-2 {
  font-size: 48px;
  font-family: 'Atlantis Inline Grunge';
}

#register-1 {
  background-color: #3c89b3;
  border-radius: 500px;
  transition: background-color ease-in-out 0.3s;
  z-index: 1;
}

#register-2 {
  top: 2em;
  position: relative;
  background-color: #3c89b3;
  font-size: 30px;
  color: white;
  padding: 10px 50px;
  border-radius: 500px;
  transition: background-color ease-in-out 0.3s;
}

#register-2:hover, #register-1:hover {
  background-color: #5d9abb;
  transition: background-color ease-in-out 0.3s;
}

#about-title, #sched-title, #team-title, #cont-title, #faq-title {
  color: white;
  font-size: 52px;
}

#about p {
  font-size: 20px;
  padding: 0px 50px 0px;
}

#theme {
  font-size: 46px;
  color: #91F9E6;
}

#atlantis-image {
  background-color: royalblue;
}

#fish-image {
  filter: brightness(70%) saturate(230%);
  -webkit-filter: brightness(70%) saturate(230%);
  -moz-filter: brightness(70%) saturate(230%);
  position: absolute;
  transform: translateY(-150px);
  width: 75%;
}

#copyright {
  font-size: 16px;
  color: rgba(30, 151, 215, 70%);
}

#map {
  height: 500px;
  width: 100%;
}

#ft {
  color: rgba(255, 255, 255, 50%);
  font-size: 16px;
  transition: 0.3s ease color;
}

#ft:hover {
  color: rgba(255, 255, 255, 100%);
  transition: 0.3s ease color;
}

#terms-content, #imprint-content, #privacy-content {
  width: 100%;
  height: 60vh;
  /* padding-right: 0px; */
}

ul li:not(nav .container ul li) {
  list-style: disc outside none;
  display: list-item;
  margin-left: 3em;
}

ol li {
  list-style: decima;;
  display: list-item;
  margin-left: 3em;
}

#name {
  color: rgba(255, 255, 255, 90%);
  padding: 10px 0px 10px;
  font-size: 20px;
}

#position {
  color: #b5ccff;
}

#top-btn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  /* z-index: 1; */
  font-size: 18px;
  border: none;
  outline: none;
  background-color: none;
  color: rgba(255, 255, 255, 60%);
  cursor: pointer;
  padding: 15px;
  border-radius: 4px;
  transition: 0.3s ease background-color;
}

#top-btn:hover {
  background-color: rgba(255, 255, 255, 20%);
  transition: 0.3s ease background-color;
}

#sched-table table {
  width: 80%;
  margin: 0 auto;
}

.wrap-collapsible {
  z-index: 1;
}

/* FAQ styles */
input[type='checkbox'] { 
  display: none; 
} 

.lbl-toggle { 
  display: block; 
  font-weight: bold; 
  text-align: center; 
  padding: 1rem; 
  color: #DDD; 
  background: #2c7fac; 
  cursor: pointer; 
  border-radius: .625rem; 
  transition: all 0.25s ease-out; 
} 

.lbl-toggle:hover { 
  color: #FFF; 
} 

.lbl-toggle::before { 
  content: ' '; 
  display: inline-block; 
  border-top: 5px solid transparent; 
  border-bottom: 5px solid transparent; 
  border-left: 5px solid currentColor; 
  vertical-align: middle; 
  margin-right: .7rem; 
  transform: translateY(-2px); 
  transition: transform .2s ease-out; 
} 

.toggle:checked + .lbl-toggle::before { 
  transform: rotate(90deg) translateX(-3px); 
} 

.collapsible-content { 
  max-height: 0px; 
  overflow: hidden; 
  transition: max-height .25s ease-in-out; 
} 

.toggle:checked + .lbl-toggle + .collapsible-content { 
  max-height: 100%; 
} 

.toggle:checked + .lbl-toggle { 
  border-bottom-right-radius: 0; 
  border-bottom-left-radius: 0; 
} 

.collapsible-content .content-inner {
  background: #053768; 
  border-bottom: 1px solid #2c7fac; 
  border-bottom-left-radius: .625rem; 
  border-bottom-right-radius: .625rem; 
} 

.collapsible-content p { 
  padding: 20px;
  font-size: 16px; 
  color: white;
  font-weight: 500;
}

#about-title, #theme, #sched-title, #team-title, #cont-title, #faq-title {
  font-family: 'Atlantis Inline Grunge';
}

#imprint, #terms, #privacy {
  z-index: -1;
  display: none;
}

.sponsors-list img{
  display: inline;
  margin: 20px 30px;
  max-height: 100px;
}

/* Responsive styles */
@media only screen and (max-width: 900px) {
  nav {
    display: none;
  }

  #intro-txt-1 {
    font-size: 48px;
  }
  
  #intro-txt-2 {
    font-size: 20px;
  }

  #cont {
    width: 95%;
  }

  #sched-table table {
    width: 100%;
    margin: 0 auto;
  }
}