@font-face {
    font-family: osr;
    src: url(OpenSans-Regular.ttf);
}
html {
    width: 100%;
    height: 100%;
    margin: 0;
}
body {
    width: 100%;
    height: auto;
    margin: 0;
}
h1 {
    font-family: osr;
    margin: auto;
}
h2 {
    font-family: osr;
    margin: auto;
}
h3 {
    font-family: osr;
    margin: auto;
}
h4 {
    font-family: osr;
    margin: auto;
}
h5 {
    font-family: osr;
    margin: auto;
}
h6 {
    font-family: osr;
    margin: auto;
}

header {
    width: 100%;
    height: auto;
    position: fixed;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    opacity:0.7;
    background-color:purple;
}
#header-logo {
    display: block;
    padding: 10px;
    cursor: pointer;
}
footer {
    background-color: purple;
    padding: 10px;
}
#footer-logo {
    width: 50px;
    height: 50px;
    display: block;
    margin: auto;
}
#year {
    display: block;
    padding: 10px;
    cursor: pointer;
}
#menu {
    display: block;
    padding: 10px;
    cursor: pointer;
}

#first-div {
    width:100%;
    height:100vh;
    position:relative;
}

#first-title-div {
    width:100%;
    padding-top:150px;
    padding-bottom:50px;
    box-sizing:border-box;
    position: absolute;
    top: 0;
}
#first-control-div {
    width:100%;
    
    padding-bottom:150px;
    box-sizing:border-box;
    position: absolute;
    bottom: 0;
    margin: auto;
}

#button-div {
    width: max-content;
    display: flex;
    margin: auto;
    gap: 10px;
}

#book-button {
    width: 150px;
    padding: 10px;
    background-color: purple;
    color: white;
    border-style: none;
    border-radius: 25px;
    font-family: osr;
    display: block;
    cursor: pointer;
    text-decoration: none;
}