Why does a margin appear when I set a fontsize to a text?

Question

css

When I set the font-size to the text, I get a margin above and below which is equal to the same font-size.
I just started learning sass, maybe something is wrong with nulling styles?
As I understand DevTools says that through my style sheet I set margin-block-start: 1em but when I rummaged through zeroing styles I found only one suitable line and deleting it did not help...

body {
  background-color: #887d7d;
  height: 100%;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

a {
  color: black;
  text-decoration: none;
}

h1 {
  font-family: "Pacifico";
}

h2 {
  font-family: "Raleway-heavy";
  font-size: 60px;
}

p {
  font-family: "Raleway-light";
}

.header {
  height: 100vh;
  background: url(../img/background1.png) no-repeat;
  background-position: center;
  background-size: cover;
}

.header__nav__link {
  list-style-type: none;
  padding: 10px;
  -ms-flex-pack: distribute;
      justify-content: space-around;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.header__nav__link li {
  font-family: "Raleway-bolt";
}

.header__nav__link li:first-child {
  font-size: 30px;
  font-family: "Pacifico";
  margin: 0 320px 0 50px;
}

.header__nav__link li:hover {
  border-top: solid #ff6033;
}

.header__info {
  width: 320px;
  margin: 250px 0 0 150px;
}

.header__info__text {
  margin: 30px 0;
  line-height: 1.7em;
}

.header__info__button {
  border-width: 0px;
  text-transform: uppercase;
  font-family: "Raleway-light";
  padding: 20px 25px;
  color: #ffff;
  background-color: #ff6033;
}

.main {
  color: #ffff;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  background-color: #00b0b0;
}

.main__block {
  margin: 17px 80px 0 80px;
}

.main__block__title {
  font-family: "Raleway-heavy";
  font-size: 50px;
}

Answer 1

this is the user agent stylesheet. Tobish default styles for this element from the browser. it doesn't depend on your style. and you see 60px because this default style has a value of 1em. Google about em units