html {
  font-size: 10px;
}

body {
/*background-image: url("../images/national-flag-memorial.jpg");
background-repeat: no-repeat;
background-size:cover;*/
margin: 0;
padding: 0;


}

#menuactivation
{
  display: block;
  position: relative;
  top: 50px;
  left: 50px;
  z-index: 1;
  -webkit-user-select: none;
  user-select: none;

}

#menuactivation a
{
  text-decoration: none; 
  color:slategray;
  transition: color 0.3s ease;
}

#menuactivation a:hover
{
  color:steelblue
}

#menuactivation input
{
  display: block;
  width: 40px;
  height: 32px;
  position: absolute;
  top: -7px;
  left: -5px;
  cursor: pointer;
  opacity: 0;
  z-index: 2;
  -webkit-touch-callout: none;
}

#menuactivation span
{
  display:block;
  width:33px;
  height: 4px;
  margin-bottom: 5px;
  position:relative;
  background: #cdcdcd;
  z-index: 1;
  transform-origin: 4px 0px;
  transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0),
              background 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0),
              opacity 0.55s ease;

}

#menuactivation span:first-child
{
  transform-origin: 0% 0%;
}

#menuactivation span:nth-last-child(2){
  transform-origin: 0% 100%;
}

#menuactivation input:checked ~ span
{
  opacity: 1;
  transform: rotate(20deg) translate(-2px, -1px);
  background: #232323;
}

#menu
{
  position: top;
  width: 300px;
  margin: -80px 0 0 -10px;
  padding: 50px;
  padding-top: 25px;
  
  background: transparent;
  list-style-type: none;

  transform-origin: 0% 0%;
  transform: translate(-100%, 0);
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0);
}

#menu li
{
  padding: 10px 0;
  font-size: 22px;
}

#menuactivation input:checked ~ ul
{
  transform: none;
}



a    {font-size: 15px;
  font-family: bold;
}

p    {
  font-size: 25px;
  font-family: helvetica;
}

.introduction {padding: 20px;
  border: 5px solid rgb(95, 166, 173);
  list-style-type: square;
  font-size: 20px;
}


li, ul {
  margin-left: 25px;
}

.presentation-card {
  color: rgb(77, 76, 85);
  font-size: 18px;
}

.presentation-links:hover{
  color: deeppink;
}

.collatz-input{
  font-size: 20px;
}
.highbar{
  display: flex;
  justify-content:space-between;
  align-items: flex-end center;
  padding:auto;
  margin:auto;
}

.logoimg{
  position: relative;
  bottom: -60px;
  width: auto;
  max-width: 86%;
  height: 900%;
  display: block;
  margin-top: -8%;
  margin-left: auto;
  margin-right: auto;
}


ul.navlinks{
  flex: 1;
  text-align: right;
}

.navlinks ul li{
  display: inline-block;
  list-style: none;
  margin: 0
}

.navlinks ul li a{
  text-decoration: none;
  color: steelblue;
  padding: 0 10px;
  position: relative;
}

.navlinks ul li a::after{
  content: '';
  width: 0;
  height: 10px;
  background: #8F7E4F;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: -110px;
  transition: 0.5s;
}
.navlinks ul li a:hover::after{
  width: 100%;
}
.navlinks a:hover{
  color: deeppink
}

@media screen and (max-width: 600px){
  .navlinks{
    visibility: hidden;
  }
}

.visdat{
  font-size: large;
}

.visdat img{
  width: 2%;
  height: 20;
}