@import url("https://fonts.googleapis.com/css?family=Poppins:200,300,400,500,600,700,800,900&display=swap");

:root {
  --main-background: hsl(218, 28%, 13%);
  --email-box-background: hsl(217, 28%, 15%);
  --footer-background: hsl(216, 53%, 9%);
  --test-background: hsl(219, 30%, 18%);
  --cyan: hsl(176, 68%, 64%);
  --blue: hsl(198, 60%, 50%);
  --white: #fff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-family: "Poppins", Arial;
  background: var(--main-background);
  color: var(--white);
  scroll-behavior: smooth;
}

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

ul {
  list-style: none;
}

section {
  width: 85%;
  margin: auto;
}

section.header,
footer {
  width: 100%;
}

p {
  line-height: 1.8;
}

/* button */
.btn {
  display: inline-block;
  padding: 0.9rem 5rem;
  border-radius: 35px;
  border: 0;
  font-size: 16px;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
}
.btn:focus {
  outline: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(to right, var(--cyan), var(--blue));
  color: #fff;
}

.btn-primary:hover {
  background: linear-gradient(to left, var(--cyan), var(--blue));
}

/* Text */
.text-center {
  text-align: center;
}

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