body {
  background-image: url("https://s3-us-west-1.amazonaws.com/talons-dev/6496.jpg");
  background-size: 100%;
  background-position: center;
  background-attachment: fixed;
  display: flex;
  justify-content: center;
}

h1 {
  font-size: 36px;
  font-weight: 400;
  margin: 20px 0 0 0;
}

h2 {
  font-size: 18px;
  font-weight: 300;
}

h3 {
  font-size: 24px;
  font-weight: 600;
}

h4 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 24px;
  font-weight: 400;
}

h5 {
  font-weight: 300;
  margin: 5px 0 0 0;
}



a, a:link,
a:active, a:visited {
  color: #ffffff;
  margin: 0 10px;
  opacity: 0.8;
  transition: 0.2s;
}

a:hover {
  opacity: 1;
}

main {
  color: white;
  display: flex;
  font-family: 'Raleway', sans-serif;
  font-weight: 400;
  flex-direction: column;
  max-width: 1100px;
  width: 100%
}

.header {
  display: flex;
  justify-content: space-between;
}

.header-links {
  align-self: center;
}

.icons-container {
  display: flex;
  justify-content: center;
}

.citation, .citation:link, .citation:hover,
.citation:active, .citation:visited {
  color: #ffffff;
  font-weight: 300;
  text-decoration: none;
  margin: 10px 0;
}

.graph {
  width: 1000px;
  height: 100px;
  align-self: center;
  margin: 10px 0 20px 0;
}

.simulation {
  width: 1000px;
  height: 750px;
  align-self: center;
  border-radius: 10px;
  cursor: pointer;
}

.simulation-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.control-button {
  background-color: rgba(52, 74, 145, 0.7);
  color: #f4f4d7;
  margin: 0 5px;
  padding: 5px 10px;
  border: none;
  border-radius: 7px;
  transition: 0.3s;
}

.control-button:hover {
  background-color: rgba(52, 74, 145, 1);
  opacity: 1;
}

.sliders-container {
  align-self: center;
  width: 100%;
  display: flex;
  align-items: center;
  background-color: rgba(35, 63, 109, 0.7);
  box-sizing: border-box;
  padding: 20px;
}

.sliders {
  width: 50%;
  display: flex;
  flex-direction: column;
}

.slider {
  align-self: center;
  -webkit-appearance: none;
  appearance: none;
  width: 90%;
  height: 25px;
  background-color: transparent;
  background-image: linear-gradient(to bottom, rgba(235, 235, 235, 0), rgba(235, 235, 235, 0) 40%, rgba(235, 235, 235, 1) 50%, rgba(235, 235, 235, 0) 60%, rgba(235, 235, 235, 0) 100%);
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

.slider:hover {
    opacity: 1;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    cursor: pointer;
    border-radius: 5px;
}

.slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    cursor: pointer;
    border-radius: 5px;
}

.predator > .slider::-webkit-slider-thumb {
  background-color: #354b6d;
  border: 2px solid #efe092;
}

.predator > .slider::-moz-range-thumb {
  background-color: #354b6d;
  border: 2px solid #efe092;
}

.prey > .slider::-webkit-slider-thumb {
  background-color: #efe092;
  border: 2px solid #354b6d;
}

.prey > .slider::-moz-range-thumb {
  background-color: #efe092;
  border: 2px solid #354b6d;
}