NOOTAN ISC Physics XI (Part 1 and 2) (Academic year 2023-24)

.modal-window {
position: fixed;
background-color: rgba(255, 255, 255, 0.25);
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: 999;
visibility: hidden;
opacity: 0;
pointer-events: none;
-webkit-transition: all 0.3s;
transition: all 0.3s;
}
.modal-window:target {
visibility: visible;
opacity: 1;
pointer-events: auto;
}
.modal-window > div {
width: 400px;
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
padding: 2em;
background: #ffffff;
}
.modal-window header {
font-weight: bold;
}
.modal-window h1 {
font-size: 150%;
margin: 0 0 15px;
}

.modal-close {
color: #aaa;
line-height: 50px;
font-size: 80%;
position: absolute;
right: 0;
text-align: center;
top: 0;
width: 70px;
text-decoration: none;
}
.modal-close:hover {
color: black;
}

/* Demo Styles */
html,
body {
height: 100%;
}

body {
font: 600 18px/1.5 -apple-system, BlinkMacSystemFont, “Segoe UI”, Roboto, Oxygen-Sans, Ubuntu, Cantarell, “Helvetica Neue”, sans-serif;
background-image: -webkit-gradient(linear, left top, right top, color-stop(0, #7f53ac), to(#657ced));
background-image: linear-gradient(to right, #7f53ac 0, #657ced 100%);
color: black;
}

a {
color: inherit;
}

.container {
display: grid;
-webkit-box-pack: center;
justify-content: center;
-webkit-box-align: center;
align-items: center;
height: 100vh;
}

.modal-window div:not(:last-of-type) {
margin-bottom: 15px;
}

small {
color: #aaa;
}

.btn {
background-color: #fff;
padding: 1em 1.5em;
border-radius: 3px;
text-decoration: none;
}
.btn i {
padding-right: 0.3em;
}