html {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

*,
*::before,
*::after {
  -webkit-box-sizing: inherit;
  -moz-box-sizing: inherit;
  box-sizing: inherit;
}

:root {
  --background: #eee;
  --card-background: white;
  --text: #1a1a1a;
  --border: #ccc;
  --stroke: #a9a9a9;
  --blue-light: #2196f3;
  --blue-transparent: #2196f3aa;
  --blue-dark: #1e88e5;
  --link: #1e88e5;
  --link-visited: #b344e2;
  --button-outline: black;
  --red: #ff6464;
  --yellow: #ffee58;
  --yellow-light: #fffde7;
}

[data-theme="dark"] {
  --background: #090d13;
  --card-background: #0d1117;
  --text: #efefef;
  --border: #2a2e34;
  --stroke: #737373;
  --blue-light: #1976d2;
  --blue-transparent: #2196f320;
  --blue-dark: #1565c0;
  --link: #5caff1;
  --link-visited: #d57afc;
  --button-outline: black;
  --red: #ff6464;
  --yellow: #a59809;
  --yellow-light: #716800;
}

body {
  background: var(--background);
  font-family: "Open Sans", sans-serif;
  padding-top: 10px;
  color: var(--text);
}

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

.github {
  text-align: center;
}

.github span {
  margin: 0 2px;
}

.center {
  text-align: center;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:visited {
  color: var(--link-visited);
}

a:hover {
  filter: brightness(1.2);
}

.example a:hover {
  filter: unset;
}

.container {
  width: 96%;
  max-width: 1000px;
  margin: 0 auto;
}

.footer {
  margin: 50px 0;
}

.details {
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 5px 20px;
  margin-bottom: 10px;
  background: var(--card-background);
}

.details > h2 {
  margin: 0;
  margin-top: 10px;
}

/* link underline effect */

a.underline-hover {
  position: relative;
  text-decoration: none;
  color: var(--text);
  margin-top: 2em;
  display: inline-flex;
  align-items: center;
  gap: 0.25em;
}
.underline-hover::before {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 0;
  height: 1px;
  background-color: var(--blue-light);
  transition: width 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}
@media (hover: hover) and (pointer: fine) {
  .underline-hover:hover::before {
    left: 0;
    right: auto;
    width: 100%;
  }
}