#header {
  background-color: white;
  height: 100px;
  width: 99vw;
  border-bottom: 5px solid orangered;
  position: sticky;
  top: 0px;
  z-index: 11;
}
footer {
  position: relative;
}
html {
  display: flex;
  flex-direction: column;
}
body {
  display: flex;
  flex-direction: column;
  margin: 0;
  min-height: 100vh;
  width: 100%;
}
.navigation-bar {
  width: 100%;
  height: 50px;
  position: relative;
  color: #337ab7;
  font-size: 25px;
  top: 5px;
  font-family: "Raleway", sans-serif;
}
.navigation-bar a {
  color: #337ab7;
  text-decoration: none;
}
.navigation-bar a:hover {
  text-decoration: underline;
}
.side-nav {
  position: relative;
  height: 100%;
  min-height: 300px;
  width: 20vw;
  min-width: 100px;
  top: 20px;
  float: left;
}
.nav-element {
  height: 50px;
}
.nav-element a {
  margin-left: 20px;
  font-weight: 600;
  text-decoration: none;
  color: #3e6389;
  font-size: 20px;
  font-family: "Open sans", sans-serif;
}
.nav-element a:hover {
  text-decoration: underline;
  color: dark-blue;
}
.cp {
  color: #ff6600;
}
.cp a:hover {
  text-decoration: underline;
  text-decoration-color: #ff6600;
}
.heading {
  padding: 10px 20px;
  text-align: center;
  height: 100px;
}

.heading h1 {
  color: #2c99ce;
  font-family: "Raleway", sans-serif;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.main-section {
  position: relative;
  height: auto;
  width: 75vw;
  display: inline-block;
  border-left: 1px solid rgba(0, 0, 0, 0.1);
  margin: 5px 0;
}
.csection {
  position: relative;
  height: auto;
  min-height: 250px;
  width: 100%;
}
.des {
  width: 95%;
  height: 100%;
  min-height: 250px;
  font-family: "Raleway", sans-serif;
  font-weight: 300;
  left: 2.5%;
  position: relative;
  text-align: justify;
}

.des p {
  font-size: 20px;
}
.des ol {
  font-size: 20px;
}
footer {
  height: 150px;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  position: relative;
  font-family: "Raleway", sans-serif;
  margin-top: auto;
}

.foot1 {
  float: left;
  width: 32%;
  position: relative;
  left: 1.5%;
}
.fheading h4 {
  margin-top: 0px;
  
  color: whitesmoke;
}
.fheading {
  height: 20px;
  width: 100%;
  padding: 10px 0px;
  color: whitesmoke;
  border-width: 0.15rem;
  border-style: solid;
  border-image: linear-gradient(to right, #3ec1d5 20%, #555 0%) 0% 0% 100% 0%;
}
.fdes a {
  color: whitesmoke;
  text-decoration: none;
  margin: 5px 0;
  display: block;
}
.fdes p {
  color: whitesmoke;
  text-decoration: none;
  margin: 5px 0;
  display: block;
}

.fdes a:hover {
  text-decoration: underline;
  color: gray;
  transition-duration: 0.25s;
}
.foot2 {
  display: inline-block;
  width: 32%;
  position: relative;
  left: 3%;
}
.foot3 {
  float: right;
  width: 30%;
  right: 1.5%;
  position: relative;
}
.sm {
  border-radius: 50%;
  height: 25px;
  width: 25px;
  margin: 5px;
}
.desm {
  display: flex;
}
.endfoot {
  background-color: rgba(255, 255, 255, 0.1);
  width: 100%;
  height: 25px;
  text-align: center;
  position: relative;
  top: 15px;
  color: whitesmoke;
}
.endfoot a {
  top: 5px;
  color: dodgerblue;
  text-decoration: none;
}
.endfoot a:hover {
  text-decoration: underline;
  opacity: 0.8;
}
.menu-btn .bar {
  width: 25px;
  height: 0.5px;
  background-color: black;
  margin: 8px 0;
  position: relative;
  left: 12.5px;
}

.menu-btn {
  position: relative;
  height: 100%;
  width: 70px;
  float: left;
  outline: none;
  border: none;
}

.menu-btn:hover {
  cursor: pointer;
}

header img {
  display: inline-block;
  width: 140px;
  height: 90px;
  position: relative;
  left: 40px;
  top: 5px;
}
.right-head {
  height: 50px;
  top: 40px;
  float: right;
  position: relative;
  right: 10px;
}
.right-head a {
  text-decoration: none;
  color: #2c98cd;
  margin: 20px;
  padding: 10px;
  font-family: "Raleway", sans-serif;
}
.right-head a:hover {
  background-color: #77bb41;
  border-radius: 5px;
  color: white;
  text-decoration: underline;
  transition-duration: 0.1s;
}
@media screen and (max-width: 850px) {
  .side-nav {
    position: absolute;
    background-color: white;
    opacity: 1;
    z-index: 10;
    width: 60%;
    left: 20%;
    border-radius: 10px;
    box-shadow: 5px 5px rgba(0, 0, 0, 0.2);
    padding-top: 20px;
    display: none;
    overflow-y: scroll;
  }

  .main-section {
    width: 100%;
  }
  .foot1 {
    float: left;
    width: 45%;
    position: relative;
  }
  .foot2 {
    display: inline-block;
    left: 6%;
    width: 45%;
    position: relative;
  }
  .foot3 {
    float: left;
    width: 95%;
    margin: 0 2.5%;
    position: relative;
  }
  footer {
    height: 250px;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    position: relative;
    font-family: "Raleway", sans-serif;
  }
  .endfoot {
    display: block;
    position: absolute;
    top: 225px;
  }
  .endfoot a {
    color: dodgerblue;
    text-decoration: none;
  }

  @media screen and (max-height: 700px) {
    .side-nav {
      height: 400px;
    }
  }

  @media screen and (min-height: 700px) {
    .side-nav {
      height: 500px;
    }
  }
}

@media screen and (min-width: 500px) {
  .math {
    font-size: 15px;
  }
}

@media screen and (max-width: 500px) {
  .math {
    font-size: 10px;
  }
}
@media screen and (max-width: 400px) {
  .math {
    font-size: 9px;
  }
}

@media screen and (min-width: 700px) {
  .right-head {
    display: block;
  }
}
@media screen and (max-width: 700px) {
  .right-head {
    display: none;
  }
}
#feedback-btn {
  color: dodgerblue;
  text-decoration: none;
  padding: 10px;
  border: 0.5px solid dodgerblue;
  border-radius: 5px;
}

#feedback-btn:focus {
  box-shadow: 0 0 0 0.2rem rgb(0 123 255 / 25%);
}