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


body
{
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color:white;
 }

/* ************************************ */
/* ******    BACKGROUND-IMAGE   ******* */
/* ************************************ */

body
{
  
    background-image: url(https://ada-lovelace.fr/img/ada_1920.jpg);
  
  /* Image is centered vertically and horizontally at all times */
  background-position: center center;
  
  /* Image doesn't repeat */
  background-repeat: no-repeat;
  
  /* Makes the image fixed in the viewport so that it doesn't move when the content height is greater than the image height */
  background-attachment: fixed;
  
  /* This is what makes the background image rescale based on its container's size */
  background-size: cover;
  
  /* Pick a solid background color that will be displayed while the background image is loading */
  background-color:#464646;

}

/* ************************************ */
/* ****BACKGROUND-IMAGE RESPONSIVE***** */
/* ************************************ */

@media only screen and (max-width: 800px) 
{
body 
{
    /* adaptive img for smartphone */
    background-image: url(https://ada-lovelace.fr/img/ada_800.jpg);
}
}


img 
{
  width:150px;
}

/* ************************************ */
/* ************************************ */
/* ************    MENU   ************* */
/* ************************************ */
/* ************************************ */
/* ************************************ */




/* reglage texte et couleurs du menu */

    .menu01 
{
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    font-size: 1rem;
    font-weight: normal;
    line-height: 1.4;
    color: GRAY;
}


    /* bandeau de navigation */

    nav 
{
    color: white;
    border-bottom:white 1px solid;
    box-shadow:   
    0 1px 2px 0 rgba(0, 0, 0, 0.15),
    0 2px 1px -5px rgba(0, 0, 0, 0.12),
    0 1px 6px 0 rgba(0, 0, 0, 0.2);
  }


   /* mise en forme du child de la nav */

     .nav-wrapper 
{
     display: flex;
     flex-direction: row;
     flex: 1;
     flex-basis: auto;
     justify-content: space-between;
     align-items: center;
     max-width: 70rem;
     width: 100%;
     margin: 0 auto;
     padding: 0 2rem;
}
  
      /* le logo */

      .nav-brand
{
        font-family: inherit;
        font-size: 1.7rem;
        font-weight: 700;
        line-height: inherit;
        text-transform: uppercase;
        color: white;
}

      .nav-button 
{
        display: none;      
}


      /* mise en forme des liens */

      .nav-link
{
        display: flex;
        flex-direction: row;
        flex: 1;
        flex-basis: auto;
        justify-content: center;
        align-items: center;
}

        /* apparence des liens */

        .menu01 a
{
          font-size: 1rem;
          font-weight: 500;
          color: white;
          padding: 1.3rem;
          text-decoration: none;
          transition: all 0.3s ease-in;
}


      /* survol des liens */

          .menu01 a:hover
{
            color: white;
            background: rgb(19,27,29);
              transition: all 0.3s ease-in;    
}

      /* on fait disparaitre la case à cocher*/

      #nav-check
{
        display: none;
}

  

/* ************************************ */
/* ************************************ */
/* RESPONSIVE MENU */
/* ************************************ */
/* ************************************ */

@media screen and (max-width: 800px) 
{ 
  
  /* start */

      .nav-wrapper
{
        padding: 1rem;
}


      .nav-button
{
          display: inline-block;
          position: absolute;
          top: 0;
          right: 0;
}

       .nav-menu label
{
            display: inline-block;
            width: 3rem;
            height: 3rem;
            margin: 1.7rem 0;
}

        .nav-menu span
{
              display: block;
              width: 2rem;
              height: 0.5rem;
              border-top: 2px solid white;
}

        .nav-link
{
          z-index: 9999 !important;
          position: absolute;
          display: block;
          width: 100%;
          background-color: rgba(19, 27, 29, 0.95);
          transition: all 0.3s ease-in;
          top: 4.2rem;
          left: 0;
          z-index: -2;
          overflow: hidden;
}

          .nav-link a
{
            display: block;
            width: 100%;
}

          /* si burger cliqué */
         
            
          #nav-check:not(:checked) + .nav-link
{
            height: 0;
}

          #nav-check:checked + .nav-link
{
            height: calc(100vh - 4.2rem);
            overflow: hidden;
}
           
/* apparence des liens du menu MOBILE */
  
  .menu01 a 
{
          font-size: 1rem;
          font-weight: 500;
          color: white;
          padding: 1.3rem;
          text-decoration: none;
          transition: all 0.3s ease-in;
}


/* survol des liens */
  
         .menu01 a:hover 
  {
            color: rgb(19,27,29);
            background: white;
              transition: all 0.3s ease-in;   

  }

 /* end */ 
  
}


/* ************************************ */
/* ************************************ */
/* **********   FIN MENU   ************ */
/* ************************************ */
/* ************************************ */
/* ************************************ */


/* start VIDEO YOUTUBE */

.parent-yt
{
  height:auto;
  width:80%;
  margin:auto;
  margin-top:5%
}


.taillevideoyoutube
{
    width: 80%;
    margin: auto;
    border:solid 1px;
    background:rgba(19, 27, 29, 0.95);
    padding:20px;
    border-radius:8px;
}


.videoyoutube
{
	position: relative;
	padding-bottom: 56.25%;
	padding-top: 30px;
	height: 0;
	overflow: hidden;
}

.videoyoutube iframe,  
.videoyoutube object,  
.videoyoutube embed
{
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
        border:none;
}

@media screen and (max-width: 800px)
{ 
  
 .taillevideoyoutube 
{
    width:100%;
    border:none;
    border-radius:none;
 background:none;
   margin-top:30%;
padding:0;
}
}


/* END VIDEO YOUTUBE */

.all-center-flex-child div p
{
  text-align:center
}

/* start list */

.parent-list
{
  padding-top:50px;
  display: flex;
  justify-content: center;
}

.all-center-flex-child
{
   width:90%;
   background:rgba(19, 27, 29, 0.95);
   border:1px white solid;
   color:#fff;
   padding:20px;
   border-radius:8px;
}

ul
{
  padding-left:20px;
  list-style: square;  
  line-height:50px;
}

ul a, .all-center-flex-child div p a
{
color:white;
text-decoration:grey underline dotted;
transition: all 0.3s ease-in;
}

ul a:visited
{
color:white;
}

ul a:hover, .all-center-flex-child div p a:hover
{
letter-spacing:5px;
color:grey; 
transition: all 0.3s ease-in;
}


/* end list */

/* ***********boite de texte central******* */

/* start all center box */

.all-center-flex-parent
{
  height:80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.all-center-flex-child
{
  width:70%;
background:rgba(19, 27, 29, 0.95);
  border:1px white solid;
color:#fff;
  padding:20px;
border-radius:8px;
}

/* end all center box */

.all-center-flex-child p:first-of-type
{
padding-bottom:20px;
}

@media screen and (max-width: 800px) 
{
.all-center-flex-child 
 {
 width:95%
 }
}

.content-button
{
text-align:center
}

/*bouton*/

.button_start_the_tour
{
  margin-top:300px;
padding:20px;
border-radius:8px;
background:rgba(19, 27, 29, 0.95);
  border:1px white solid;
color:#fff;
  letter-spacing:10px;
  box-shadow: 5px 5px 5px 5px rgba(0, 0, 0, .2);
  transition: all 0.3s ease-in;
     font-family: inherit;
       font-size: 1.7rem;
       font-weight: 700;
       line-height: inherit;
       text-transform: uppercase;
       color: white;      
}

.button_start_the_tour:hover
{
background:white;
color:rgba(19, 27, 29, 0.95);
  cursor:pointer; /* affiche la main au survol */
  transition: all 0.3s ease-in;
  box-shadow: none; /* enleve l'ombre au survol */
  border:1px rgba(19, 27, 29, 0.95) solid;
}

form
{
  display:inline
}

@media screen and (max-width: 800px)
{
 .button_start_the_tour {
    width:85%
  }
}