base.css

@import url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.1/css/all.min.css");
@import url("https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@300;600;800&display=swap");

:root {
  /* (Light Mode Text) */
  --col-text: hsl(200, 15%, 8%);
  /* (Light Mode Input) */
  --col-input: hsl(0, 0%, 52%);
  /* (Light Mode Background) */
  --col-bg: hsl(0, 0%, 98%);
  /* & Light Mode Elements */
  --col-ele: white;

  --font-size: 16px;
  --shadow: 0 5px 30px -7px #1112;
  --shadow-intense: 0 2px 10px -1px #1113;
  --Family: "Nunito Sans", sans-serif;
  /* --Weights: 300, 600, 800 */
}

html.is_dark {
  /* (Dark Mode Elements) */
  --col-ele: hsl(209, 23%, 22%);
  /* (Dark Mode Background) */
  --col-bg: hsl(207, 26%, 17%);
  /* (Dark Mode Text) */
  --col-text: white;

}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
}

html,
body {
  font-family: var(--Family);
  font-size: var(--font-size);
  background-color: var(--col-bg);
  color: var(--col-text);
}

h1 {
  font-size: 2.2rem;
}

.label_value {
  line-height: 0.5;
  font-weight: 300;
}

p {
  font-size: 1.1rem;
  margin-top: 0.5rem;
}

.label {
  line-height: 0.5;
  font-weight: 600;
}

a {
  text-decoration: none;
  color: var(--col-text);
  cursor: pointer;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: rgba(255, 255, 255, 0);
}

.navbar {
  box-shadow: var(--shadow);
  background-color: var(--col-ele);

}

.navbar .nav_container {
  width: 90vw;
  margin: auto;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
}

.btn {
  display: inline-block;
  cursor: pointer;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: rgba(255, 255, 255, 0);

}

.btn_fill {
  padding: 0.5rem;
  min-width: 7rem;
  border-radius: 0.2rem;
  box-shadow: var(--shadow-intense);
  background: var(--col-ele);
  text-align: center;
  transition: all 0.05s ease-in-out;
}

.btn_fill:hover {
  transform: scale(1.06);
}