@import url("https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;1,300;1,400&display=swap");

html {
    scroll-behavior: smooth;
    font-family: "Roboto", sans-serif;
}

a {
    text-decoration: none;
}

.page__main {
    /* Ảnh nền của trang đầu tiên nếu bạn muốn đổi thì đổi tại đây */
    background-image: url("../img/background.png");
    background-repeat: no-repeat;
    margin: 0;
    padding: 0;
    background-size: cover;
    background-position-y: -18rem;
}
.buttons {
    display: flex;
    column-gap: 3rem;
    padding: 2rem;
}

.btn-bir:hover {
    background-position: right center;
    color: #fff;
    text-decoration: none;
}

.btn-bir {
    background-image: linear-gradient(
        to right,
        #314755 0%,
        #26a0da 51%,
        #314755 100%
    );
    margin: 10px;
    padding: 15px 45px;
    text-align: center;
    text-transform: uppercase;
    transition: 0.5s;
    background-size: 200% auto;
    color: white;
    box-shadow: 0 0 20px #eee;
    border-radius: 10px;
    display: block;
}

.btn-timeline {
    background-image: linear-gradient(
        to right,
        #da22ff 0%,
        #9733ee 51%,
        #da22ff 100%
    );
}
.btn-timeline {
    margin: 10px;
    padding: 15px 45px;
    text-align: center;
    text-transform: uppercase;
    transition: 0.5s;
    background-size: 200% auto;
    color: white;
    box-shadow: 0 0 20px #eee;
    border-radius: 10px;
    display: block;
}

.btn-timeline:hover {
    background-position: right center; 
    color: #fff;
    text-decoration: none;
}

.btn-gallery {
    background-image: linear-gradient(
        to right,
        #02aab0 0%,
        #00cdac 51%,
        #02aab0 100%
    );
}
.btn-gallery {
    margin: 10px;
    padding: 15px 45px;
    text-align: center;
    text-transform: uppercase;
    transition: 0.5s;
    background-size: 200% auto;
    color: white;
    box-shadow: 0 0 20px #eee;
    border-radius: 10px;
    display: block;
}

.btn-gallery:hover {
    background-position: right center; /* change the direction of the change here */
    color: #fff;
    text-decoration: none;
}

.cover {
    width: 240px;
    height: 240px;
   
    box-shadow: 0 0 30px #eee;
    position: absolute;
    margin-top: 3rem;
    left: calc(50% - 100px);
  
    border-radius: 120px;
    border: 5px solid rgb(255, 17, 0);
}