body {
  line-height: 1.5;
  background-color:#F3F1F5;
  font-family: sans-serif;
}

* {
  margin: 0px;
  padding: 0px;
  box-sizing: border-box;
}
/*navbar-css*/

.topnav {
  background-color: rgb(45 200 45);
  overflow: hidden;
  font-family: "Ubuntu", sans-serif;
  font-weight: bold;
}

.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.topnav a:hover {
  background-color: #d2e4d4;
  color: black;
}

.topnav a.active {
  background-color: #0e6344;
  color: white;
}

.topnav .icon {
  display: none;
}

.topnav input[type="text"] {
  float: right;
  padding: 6px;
  border: none;
  margin-top: 8px;
  margin-right: 16px;
  font-size: 17px;
  border-radius: 11px;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {
    display: none;
  }
  .topnav a.icon {
    float: right;
    display: block;
  }
  .topnav input {
    display: none;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {
    position: relative;
  }
  .topnav.responsive a.icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }

  .topnav.responsive input {
    float: none;
    display: block;
    text-align: left;
    width: 100%;
    margin: 0;
    padding: 14px;
    border: 2px solid black;
  }
}


/*footer-css*/


.footer_div {
  max-width: 1170px;
  margin: auto;
  font-family: "Ubuntu", sans-serif;
}
.footer_row {
  display: flex;
  flex-wrap: wrap;
}
ul {
  list-style: none;
}
.footer {
  background-color: #3b590e;
  padding: 70px 0;
}
.footer_col {
  width: 25%;
  padding: 0 15px;
}
.footer_col h4 {
  font-size: 18px;
  color: #ffffff;
  text-transform: capitalize;
  margin-bottom: 35px;
  font-weight: 500;
  position: relative;
}
.footer_col h4::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  background-color: #e91e63;
  height: 2px;
  box-sizing: border-box;
  width: 50px;
}
.footer_col ul li:not(:last-child) {
  margin-bottom: 10px;
}
.footer_col ul li a {
  font-size: 16px;
  text-transform: capitalize;
  color: #ffffff;
  text-decoration: none;
  font-weight: 300;
  color: #bbbbbb;
  display: block;
  transition: all 0.3s ease;
}
.footer_col ul li a:hover {
  color: #ffffff;
  padding-left: 8px;
}
.footer_col .social-links a {
  display: inline-block;
  height: 40px;
  width: 40px;
  background-color: rgba(255, 255, 255, 0.2);
  margin: 0 10px 10px 0;
  text-align: center;
  line-height: 40px;
  border-radius: 50%;
  color: #ffffff;
  transition: all 0.5s ease;
}
.footer_col .social-links a:hover {
  color: #24262b;
  background-color: #ffffff;
}

#scrollTopBtn {
  background-color: rgba(64, 64, 64, 0.9);
  color: #fff;
  padding: 10px 10px;
  position: fixed;
  width: 40px;
  height: 40px;
  display: none;
  bottom: 0;
  margin-bottom: 0px;
  cursor: pointer;
  right: calc(50% - 20px);
  z-index: 1023;
}


@media (max-width: 767px) {
  .footer_col {
    width: 50%;
    margin-bottom: 30px;
  }
}
@media (max-width: 574px) {
  .footer_col {
    width: 100%;
  }
}




.container{
  display:grid;
 grid-template-columns:12fr 35fr 8fr;
 grid-template-rows:(2,auto);

}

.item{
  margin-top: 10%;
 margin-bottom: 0;
  padding: 10%;
  padding-bottom: 0;
  border-radius: 10px;

}
.second-nav{
  display:none;
}
.item:nth-of-type(4n){
  grid-column-start: 1;
  grid-column-end: 4;
}
.bottom{
  background-color: red;
  padding-top: 3%;
  margin-top: 0;
  height: fit-content;
  padding-bottom: 3%;
}
.left-side{
  margin-left: 10%;
  padding-left: 0;
}
.right-side{
  padding-right: 5%;
}
.middle{
  margin-top: 5%;
  background-color: white;
  line-height: 2;
  padding-left: 5%;
  padding-right: 5%;
  padding-top: 5;
  height:fit-content;
  padding-bottom: 15%;
}
.left-side-image{
  border-radius: 100%;
  width: 100%;
  height: 300px;
  margin-top: 0;
  margin-bottom: 2%;
}
.leftls{
  padding: 5%;
  padding-left: 0;
}
.left-side-list{
  color: black;
  text-decoration: none;
  font-size: 1.3rem;
}
.left-heading{
  background-color: #11052C;
  padding: 5%;
  margin-top: 5%;
}
.left-side-heading{
  color: white;
  text-decoration: none;
  font-weight: normal;
}
.leftls:hover{
  background-color: #7F7C82;
  color: white;
  cursor: pointer;
}
.height-prob{
  height: 5%;
}
hr{
  color: grey;
}
.middle p{
  line-height: 1.8;
  display:block;
  margin-top: 2%;
  margin-bottom: 2%;
}
.middle img{
  width: 250px;
  float: right;
  margin:2%;
  border-radius: 100%;
  height: 200px;
}
.middle-fst-div{
  text-align: left;
}
.middle h1,h2{
  font-weight: normal;
}
#dsa-types-image{
  width: 100%;
  border-radius: 0;
  height: auto;
  margin-top: 3%;
  margin-bottom: 3%;
}
.middle .array-img{
  width: 80%;
  height: 20%;
  float: none;
  border-radius: 1%;
}
.structure{
  background-color:#F3F1F5;
  color:black;
  padding-left: 2%;
  box-shadow: -8px -8px 15px black;
  padding:4%;
}
.structure:hover{
  background-color: #7F7C82;
  color: white;
}

.practice-prob{
  background-color: #002236;
  border-radius: 0;
}
.practice-prob-head{
  background-color: #002236;
  color: white;
  text-align: center;
  margin-top: 2%;
  font-size: 2rem;
  padding-bottom: 10px;
}
.practice-prob ul{
  list-style-type: circle;
  color: grey;
}
.practice-prob li{
  margin-left: 5%;
  margin-bottom: 2%;
}
.practice-prob li a{
  text-decoration: none;
  color: grey;
  font-size: 1.1rem;
}
.practice-prob li a:hover{
  color: white;
  font-size: 1.2rem;
}
.more-prob a{
  text-decoration: none;
  color: white;
}
.right-side img{
  width:100%;
  height:500px;
  box-shadow: -10px 10px 4px grey;

}
@media (min-width:418px) and (max-width:768px){
  .left-side{
    display:none;
  }
  .container{
    grid-template-columns: 35fr 5fr;
  }
  .item{
    margin-left: 2%;
  }

}
@media (min-width:0px) and (max-width:418px){
  .left-side{
    display:none;
  }
  .container{
    grid-template-columns: 100fr;
  }
  .item{
    margin-left: 2%;
    margin-right: 2%;
  }
}
@media (min-width:0px) and (max-width:768px){
  .second-nav{
    display:block;
    background-color: #002236;
    height: 40px;
    overflow: hidden;
  }
  .second-nav a{
    float:left;
    font-size: 16px;
    color: white;
    text-align: center;
    padding: 8px 8px;
    text-decoration: none;
  }
  .dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  font-size: 16px;
  border: none;
  outline: none;
  color: white;
  padding: 8px 8px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}
.dropdown:hover .dropbtn{
  color: grey;
  font-size: 18px;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {
  background-color: #ddd;
}

.dropdown:hover .dropdown-content {
  display: block;
}
}
@media (min-width:300px) and (max-width:450px){
  .second-nav a{
    font-size:10px;
  }
  .dropdown .dropbtn {
    font-size: 10px;
  }
}

@media (min-width:0px) and (max-width:300px){
  .second-nav a{
    font-size:10px;
  }
  .dropdown .dropbtn {
    font-size: 7px;
  }
}