@import url("https://fonts.googleapis.com/css2?family=Roboto&display=swap");

html {
  font-family: "Roboto", sans-serif;
  scroll-behavior: smooth;
}

h1 {
  font-size: 3.5em;
}

ul {
  padding-left: 20px;
}

li {
  font-size: 1.5em;
  margin: 15px;
}

a {
  color: #e0e0e0;
}

.headerLink {
  font-weight: bold;
  text-decoration: none;
  margin-right: 30px;
  font-size: 1.3em;
}

button {
  box-shadow: 3px 3px 10px 0px rgba(0, 0, 0, 0.5);
  background-color: #2a2a2a;
  text-decoration: none;
  border: none;
  font-size: 1.4em;
  color: #e0e0e0;
  font-weight: bold;
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  top: 0;
  transition: top ease 0.1s;
  padding: 15px;
  padding-left: 30px;
  padding-right: 30px;
  vertical-align: middle;
}

button:hover {
  top: -3px;
}

.arrow,
.arrow:before {
  position: absolute;
  left: 50%;
}

.arrow {
  width: 40px;
  height: 40px;
  top: 75%;
  margin: -20px 0 0 -20px;
  transform: rotate(45deg);
  border-left: none;
  border-top: none;
  border-right: 2px #fff solid;
  border-bottom: 2px #fff solid;
}

.arrow:before {
  content: "";
  width: 20px;
  height: 20px;
  top: 50%;
  margin: -10px 0 0 -10px;
  border-left: none;
  border-top: none;
  border-right: 1px #fff solid;
  border-bottom: 1px #fff solid;
  animation-duration: 2s;
  animation-iteration-count: infinite;
  animation-name: arrow;
}

@keyframes arrow {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate(-10px, -10px);
  }
}