html {
    width: 100%;
    height: 100%;
    font-size: 17px;
}
    
body {
   height: 100%;
   background: #a9a9a9;
}

.container {
    background-color: #ffffff;
    line-height: 1.4;
    margin: auto;
    overflow: hidden;
    padding-left: 20px;
    padding-right: 20px;
    border: 1px solid #000000;
}

#content {
    margin-top: 0px;
}

.separate {
    border-bottom: 1px solid #000000;
}

.separate-bottom {
    border-top: 1px solid #000000;
}

a {
    text-align: center;
    text-decoration: none;
    font-family: Arial, Helvetica, sans-serif;
}

.download {
    font-family: Arial, Helvetica, sans-serif;
    margin-left: auto;
    margin-right: auto;
    color: #000000;
    background-color: #b0ffb7;
    padding-left: 20px;
    padding-right: 20px;
    padding-top: 10px;
    padding-bottom: 10px;
    border-radius: 50px;
    border: 1px solid #000000;
    transition: background-color 0.3s;
}

.download:hover {
    background-color: #5f9ea0;
    color: #ffffff;
    border: 1px solid #ffffff;
}

h1 {
    font-family: Arial, Helvetica, sans-serif;
    color: #ffffff;
    background-color: #000000;
    font-family: Arial, Helvetica, sans-serif;
    padding: 10px;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ffffff;
    margin-top: 25px;
}

h2 {
    background-color: #ffffff;
    font-family: Arial, Helvetica, sans-serif;
    padding: 10px;
    padding: 10px;
    display: table;
    border-radius: 10px;
    border: 1px solid #000000;
    margin-top: 25px;
    margin-left: auto;
    margin-right: auto;
}

h3 {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.3rem;
}

h4 {
    text-align: center;
    font-family: Arial, Helvetica, sans-serif; 
}

h5 {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}

p {
    font-family: Arial, Helvetica, sans-serif;
    text-align: left;
}

li {
    color: #000000;
    padding-bottom: 3px;
}

#sbutton {
    background-color: #a9a9a9;
    color: #000000;
    border: 1px solid #000000;
    padding: 5px;
    font-size: 1rem;
    transition: background-color 0.3s;
}

#sbutton:hover {
    background-color: #5f9ea0;
    color: #ffffff;
    border: 1px solid #ffffff;
}

#fadein-start {
    text-align: center;
}

#fadein-welcome {
    color: #ffffff;
    font-family: Arial, Helvetica, sans-serif;
    font-style: italic;
    text-decoration: underline;
    text-shadow: 1px 1px 1px #000000;
}

.olist {
    font-family: Arial, Helvetica, sans-serif;
}

.ulist {
font-family: Arial, Helvetica, sans-serif;
}

.dbut1 {
    display: block;
    font-size: medium;
    font-family: Arial, Helvetica, sans-serif;
}

.dbut2 {
    display: none;
    font-size: medium;
    font-family: Arial, Helvetica, sans-serif;
}

.marc {
    text-align: center;
}

footer {
    background-color: #5f9ea0;
    color: #000000;
    border-top: solid 1px #000000;
}

@media(max-width:599px) {

header {
    background-image: url("creative3d-mobile.jpg");
    background-attachment: fixed; 
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 100vh;
    height: 100dvh;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
}

.top {
    padding-top: 16%;
}

#logo {
    display: block;
    width: 106px;
    height: 124px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 0px;
}

h1 {
    font-size: 1.3rem;
    display: block;
    text-align: center;
}

h2 {
    font-size: 1.8rem;
}

h3 {
    font-size: 1.3rem;
}

h4 {
    font-size: 1rem;
}

p {
    font-size: 1rem;
}

.olist {
    font-size: 1rem;
}

.ulist {
    font-size: 1rem;
}

.download {
    font-size: 1.3rem;
}

#fadein-welcome {
    font-size: 1.25rem;
}

.container {
    width: 90%;
}

footer {
    padding: 5px;
}
}

@media(max-width:600px) {

h1 {
    text-align: center;
}

h2 {
    text-align: center;
}

h3 {
    text-align: left;
}

.container {
    width: 90%;
}
}

@media(min-width:600px) and (max-width:959px) {

header {
    background-image: url("creative3d-mobile.jpg");
    background-attachment: fixed; 
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 100vh;
    height: 100dvh;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
}

.top {
    padding-top: 0%;
}

#logo {
    display: block;
    width: 106px;
    height: 124px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 0px;
}

#intro {
    display: flex;
    flex-direction: row;
    width: 600px;
    margin-left: auto;
    margin-right: auto;
}

h1 {
    font-size: 1.3rem;
    display: block;
    text-align: center;
}

h2 {
    font-size: 1.8rem;
    text-align: center;
}

h3 {
    font-size: 1.3rem;
    text-align: left;
}

h4 {
    font-size: 1rem;
    text-align: center;
}

.download {
    font-size: 1.3rem;
}

#fadein-welcome {
    text-align: center;
}

footer {
    padding: 5px;
}
}

@media(min-width:960px) {

header {
    background-image: url("creative3d.jpg");
    background-attachment: fixed; 
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 100vh;
    height: 100dvh;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
}

#creative-mobile {
    display: none;
}

.top {
    padding-top: 13%;
}

#logo {
    display: block;
    width: 132px;
    height: 154px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 0px;
}

h1 {
    font-size: 1.65rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.3rem;
}

h4 {
    font-size: 1rem;
}

h5 {
   font-size: 0.7rem; 
}

p {
    font-size: 1rem;
}

.olist {
    font-size: 1rem;
}

.ulist {
    font-size: 1rem;
}

#fadein-welcome {
    font-size: 1.5rem;
}

.download {
    font-size: 1.8rem;
}

.container {
    width: 80%;
}

#intro {
    display: flex;
    flex-direction: row;
    width: 900px;
    margin-left: auto;
    margin-right: auto;
}

h3 {
    text-align: left;
}

footer {
    padding-top: 5px;
    padding-bottom: 10px;
}
}

@media(min-width:2000px) {
    header {
    height: 1000px;
}
}

.fadein {
    animation: fade-in 2s ease-out forwards;
}

.fadein-run {
    animation: fade-in 0.5s ease-out 0.5s backwards;
}

.fadein-fast {
    animation: fade-in 0.5s;
}
    
  @keyframes fade-in {
    from {
      opacity: 0;
    }
    
    to {
      opacity: 1;
    }
  }

  .zoomin {
    animation: zoom-anim 1s;
  }

    @keyframes zoom-anim {
    0% {
        transform: scale(0);
    }
    
    100% {
        transform: scale(1);
    }
    }

    @supports (-webkit-touch-callout: none) {
    header {
    background-attachment: scroll; /* Forces scrolling behavior on iOS */
  }
}