/* declare variable always inside the root element*/
:root {
  --primary: red;
  --spacing: 4rem;
}

* {
  box-sizing: border-box;
}

body {
  font-family: "Poppins", sans-serif;
}

header {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 2rem;
  height: 100vh;
}
h1 {
  font-size: 5vw;
  line-height: 1.4em;
  margin-bottom: 2rem; /* twice the size of my root size element, which is 16 pixel*/
}

h2 {
  text-align: center;
  font-size: 3vw;
  text-transform: uppercase;
  margin-bottom: var(spacing);
}

p {
  line-height: 1.4em; /* 0.4 bigger than 100% which is 16px*/
  margin-bottom: 1em;
}

/* grab id, but id's should not be used to style*/
#about {
}
/* grab class*/
.button {
  color: var(--primary);
  font-weight: bold;
  border: 2px solid var(--primary);
  text-decoration: none;
  padding: 1rem;
}

.button:hover {
  /* changes the state of the button to hover (there is also state active/visited)*/
  color: white;
  background-color: var(--primary);
}

.about {
  background-color: var(--primary);
  color: white;
  padding: var(spacing);
}

.about-container {
  max-width: 960px;
  margin: 0 auto;
}

@media (min-width: 800) {
  /* only affects screens bigger than 800px*/
  .about-container {
    display: flex;
  }
  .about-text {
    margin-left: var(--spacing);
  }
}
.about-img {
  display: block;
  width: 100%; /* responsive - adapts to screen*/
  max-width: 350px;
  margin: 0 auto var(--spacing);
}
/*
.social-link {
    copy from slides
}

.twitter {
    background-image: url(../images/  link  da imagem);
}*/

.header-nav {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  height: 70px;
  background-color: var(--color-primary);
  padding: 0 35px;
}

.header-links {
  display: none;
}

@media (min-width: 992px) {
  .header-links {
    display: flex;
    color: var(--color-text-secondary);
  }
}

.header-links li {
  margin-right: 20px;
}

.header-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.dark-theme{

  background-color: grey;
}