main.css

*{
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: sans-serif, sans-serif;
  line-height: 1.6em
}

:root{
  --orange: #ffb500;
  --purple: #ea00ff;
  --black: #000000;
  --font1: "Comfortaa", sans-serif;
  --font2: "Passion One", sans-serif;
}

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

body{
  text-align: center;
  margin-top: 3em;
}

/* nav starts */
nav{
  height: 3em;
  background: white;
  width: 100%;
  position: fixed;
  top:0;
  left:0;
  margin:0;
  z-index:3;
}

#nav-logo{
  height: 100%;
  margin-left: 1em;
  float:left;
}

#nav-logo img{
  height: 100%;
}

#nav-container{
  float: right;
  z-index: 5;
  height: 100%;
}

.nav-links{
  height: 100%;
  float: right;
  z-index: 5;
}

/* hamburger menu  */
#menu-bar{
  background-color: transparent;
  width: 3.5em;
  height: 100%;
  padding-left:0.6em;
  padding-right: 0.6em;
  cursor: pointer;
  display: flex;
  flex-direction: column  ;
  justify-content: center;
  z-index: 5;
  position: absolute;
  top:0;
  right:0;

}

.bar{
  height: 5px;
  width: 100%;
  background-color: var(--orange);
  display:block;
  border-radius: 5px;
  margin: 0;
  transition: 0.3s ease;
}

#bar1{
  transform: translateY(-4px);
}

#bar3{
  transform:translateY(4px);
}

.nav li a{
  color: black ;
  text-decoration: none;
}

.nav li a:hover{
  font-weight: bold;
}

.nav li{
  list-style: none;
  padding: 25px 0;
  font-size: 1.5em;
}

.nav{
  padding:0;
  margin: 0 20px;
  transition: 0.3s ease;
  display: none;
  position: relative;
  z-index:5;
}

.menu-bg{
  width: 0;
  height: 0;
  background-color: var(--orange);
  transition: 0.3s ease;
  z-index:4;
  float: right;
}

.change-bg{
  width: 550px;
  height: 640px;
  border-radius: 50%;
  transform: translate(60%, -50%);
  z-index:3;

  
}

.change .bar{
  background-color: white;
}

.change #bar1{
  transform: translateY(4px) rotateZ(45deg);
}

.change #bar3{
  transform: translateY(-4px) rotateZ(-45deg);
}

.change #bar2{
  display:none;
}

.change-nav{
  display: block;
}
/* navbar ends */

h1{
  padding: 1em;
}

main{
  margin: 1em;
}

/* Leader Card Starts */
.leader_card{
  max-width: 12rem;
  border: 1px solid #c4c4c4;
  border-radius: 5px;
  overflow: auto;
  text-align: center;
  display: inline-block;
  height: 18rem;
  margin: 1em;
  padding: 1rem;
}

.leader_card:hover{
  box-shadow: 4px 4px 6px #c4c4c4;
}

.leader_card img{
  border-radius: 50%;
  width: 90%;
  height: auto;
  margin-bottom:1;
  padding:0;
}
/* Leader Card ends */

@media only screen and (min-width: 45em) {
  /* Style adjustments for viewports that meet the condition */
  #menu-bar, #menu-bg{
    display: none;
  }

  #nav{
    display: block;
  }

  #nav li{
    float: left;
    text-align: center;
    margin: 0em 1em;
    padding: 15px 0;
    vertical-align: middle;
  }
}

/*! HTML5 Boilerplate v8.0.0 | MIT License | https://html5boilerplate.com/ */

/* main.css 2.1.0 | MIT License | https://github.com/h5bp/main.css#readme */
/*
 * What follows is the result of much research on cross-browser styling.
 * Credit left inline and big thanks to Nicolas Gallagher, Jonathan Neal,
 * Kroc Camen, and the H5BP dev community and team.
 */

/* ==========================================================================
   Base styles: opinionated defaults
   ========================================================================== */

html {
  color: #222;
}

/*
 * Remove text-shadow in selection highlight:
 * https://twitter.com/miketaylr/status/12228805301
 *
 * Vendor-prefixed and regular ::selection selectors cannot be combined:
 * https://stackoverflow.com/a/16982510/7133471
 *
 * Customize the background color to match your design.
 */

::-moz-selection {
  background: #b3d4fc;
  text-shadow: none;
}

::selection {
  background: #b3d4fc;
  text-shadow: none;
}

/*
 * A better looking default horizontal rule
 */

hr {
  display: block;
  height: 1px;
  border: 0;
  border-top: 1px solid #ccc;
}

/*
 * Remove the gap between audio, canvas, iframes,
 * images, videos and the bottom of their containers:
 * https://github.com/h5bp/html5-boilerplate/issues/440
 */

audio,
canvas,
iframe,
img,
svg,
video {
  vertical-align: middle;
}

/*
 * Remove default fieldset styles.
 */

fieldset {
  border: 0;
}

/*
 * Allow only vertical resizing of textareas.
 */

textarea {
  resize: vertical;
}

/* ==========================================================================
   Author's custom styles
   ========================================================================== */

/* ==========================================================================
   Helper classes
   ========================================================================== */

/*
 * Hide visually and from screen readers
 */

.hidden,
[hidden] {
  display: none !important;
}

/*
 * Hide only visually, but have it available for screen readers:
 * https://snook.ca/archives/html_and_css/hiding-content-for-accessibility
 *
 * 1. For long content, line feeds are not interpreted as spaces and small width
 *    causes content to wrap 1 word per line:
 *    https://medium.com/@jessebeach/beware-smushed-off-screen-accessible-text-5952a4c2cbfe
 */

.sr-only {
  border: 0;
  clip: rect(0, 0, 0, 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
  /* 1 */
}

/*
 * Extends the .sr-only class to allow the element
 * to be focusable when navigated to via the keyboard:
 * https://www.drupal.org/node/897638
 */

.sr-only.focusable:active,
.sr-only.focusable:focus {
  clip: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  position: static;
  white-space: inherit;
  width: auto;
}

/*
 * Hide visually and from screen readers, but maintain layout
 */

.invisible {
  visibility: hidden;
}

/*
 * Clearfix: contain floats
 *
 * For modern browsers
 * 1. The space content is one way to avoid an Opera bug when the
 *    `contenteditable` attribute is included anywhere else in the document.
 *    Otherwise it causes space to appear at the top and bottom of elements
 *    that receive the `clearfix` class.
 * 2. The use of `table` rather than `block` is only necessary if using
 *    `:before` to contain the top-margins of child elements.
 */

.clearfix::before,
.clearfix::after {
  content: " ";
  display: table;
}

.clearfix::after {
  clear: both;
}

/* ==========================================================================
   EXAMPLE Media Queries for Responsive Design.
   These examples override the primary ('mobile first') styles.
   Modify as content requires.
   ========================================================================== */

@media only screen and (min-width: 35em) {
  /* Style adjustments for viewports that meet the condition */
}

@media print,
  (-webkit-min-device-pixel-ratio: 1.25),
  (min-resolution: 1.25dppx),
  (min-resolution: 120dpi) {
  /* Style adjustments for high resolution devices */
}

/* ==========================================================================
   Print styles.
   Inlined to avoid the additional HTTP request:
   https://www.phpied.com/delay-loading-your-print-css/
   ========================================================================== */

@media print {
  *,
  *::before,
  *::after {
    background: #fff !important;
    color: #000 !important;
    /* Black prints faster */
    box-shadow: none !important;
    text-shadow: none !important;
  }

  a,
  a:visited {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }

  abbr[title]::after {
    content: " (" attr(title) ")";
  }

  /*
   * Don't show links that are fragment identifiers,
   * or use the `javascript:` pseudo protocol
   */
  a[href^="#"]::after,
  a[href^="javascript:"]::after {
    content: "";
  }

  pre {
    white-space: pre-wrap !important;
  }

  pre,
  blockquote {
    border: 1px solid #999;
    page-break-inside: avoid;
  }

  /*
   * Printing Tables:
   * https://web.archive.org/web/20180815150934/http://css-discuss.incutio.com/wiki/Printing_Tables
   */
  thead {
    display: table-header-group;
  }

  tr,
  img {
    page-break-inside: avoid;
  }

  p,
  h2,
  h3 {
    orphans: 3;
    widows: 3;
  }

  h2,
  h3 {
    page-break-after: avoid;
  }
}