@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@100;300;400;500;600;700&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  font-size: 62.5%;
}
body {
  font-family: "Montserrat", sans-serif;
  background-color: #f2f9fa;
}
:root {
  --font-color: #0b0d21;
}

/*============ Style img ============*/
.main_header {
  position: relative;
}
.main_header img {
  width: 100%;
  height: 600px;
}

/*============ Style chữ trên img ============*/
.main_header .gioithieu {
  position: absolute;
  top: 250px;
  left: 0;
  color: #ffff;
  font-size: 75px;
  width: 100%;
  text-align: center;
  text-transform: capitalize;
  text-shadow: 0px 10px rgba(0, 0, 0, 0.3);
  transition: 0.3s ease-in-out inherit;
  /* animation: 0.5s infinite; */
}

/* Nội dung chính */
#maincont{
    margin: 100px 100px;
    text-align: justify;
}

.text2 h2{
    margin-top: 50px;
    font-size: 40px;
}
.text2 h3{
    margin-top: 30px;
    font-size: 20px;
}
.text2 p{
    font-size: 16px;
    margin-top: 15px;
    line-height: 25px;
}


/* reponsive */
@media (max-width: 900px) {
    .main_header .gioithieu {
      font-size: 50px;
    }
}
@media (max-width: 400px) {
    .main_header .gioithieu {
      font-size: 45px;
    }
}