* {
  box-sizing: border-box;
  text-decoration: none;
}
:root {
  --fonts: "Ubuntu", sans-serif;
  --background: linear-gradient(to bottom, #000000 30%, #042644 90%);
  --color-btn: #3190e4;
  --cor-secundaria: #31c9e4;
  --cor-botao: #9b37ff;
  --cor-paragrafo: #fff;
  --cor-strong: rgb(127, 128, 129);
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: var(--background);
}
.bi.bi-box-arrow-left {
  color: rgb(148, 234, 240);
  font-size: 2rem;
  margin: 20px;
  transition: all 0.5s ease;
  &:hover {
    color: var(--color-btn);
  }
}
header {
  position: relative;
  color: var(--cor-secundaria);
  padding: 50px;
  text-align: center;
}

header > p {
  color: rgb(148, 234, 240);
  font-size: 18px;
  letter-spacing: 2px;
  text-align: center;
}

hr {
  width: 60%;
  border-color: var(--cor-botao);
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--color-btn);
}

section {
  color: var(--cor-paragrafo);
  margin: 20px;
  padding: 20px;
  border-radius: 5px;
  transition: all 0.6s ease;
  -webkit-box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75);
  -moz-box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75);
  box-shadow: 10px 10px 5px 0px rgba(3, 3, 3, 0.75);
}

a:visited {
  color: inherit;
}
i {
  color: #31c9e4;
}
strong {
  color: var(--cor-strong);
}

ul {
  list-style-type: none;
  padding: 0;
}

li {
  margin-bottom: 5px;
}

footer {
  background: transparent;

  color: #fff;
  text-align: center;
  padding: 10px;
  position: relative;
  bottom: 0;
  width: 100%;
}