* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', 'Archivo Black';
    background: rgb(245, 245, 245);
    }

.category {
    padding-left: 10px;
    padding-right: 10px;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-bottom: 10px;
}

.info-text {
    text-align: center;
    padding-bottom: 15px;

}

.collapser {
    border-radius: 10px;
    border: 2px solid black;
    box-shadow: 2px 2px black;
    width: 70%;
    display: inline-block;
    margin-bottom: 10px;
}

.collapser h2:after {
  content: '+';
  font-size: 20px;
  color: black;
  float: right;
  margin-left: 5px;
  margin-right: 10px;
  margin-top: 0.5%;
  margin-bottom: 0.5%;
}

.our_tut {
    border-radius: 10px;
    border: 2px solid black;
    box-shadow: 2px 2px black;
    width: 70%;
    display: inline-block;
    margin-bottom: 10px;
}

.our_tut h2:after {
  font-size: 20px;
  color: black;
  float: right;
  margin-left: 5px;
  margin-right: 10px;
  margin-top: 0.5%;
  margin-bottom: 0.5%;
}

.our_tut h2 {
    background: -webkit-linear-gradient(left, blue, red);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}


.active h2:after {
  content: '-';
  font-size: 20px;
  color: black;
  float: right;
  margin-left: 5px;
  margin-right: 10px;
  margin-top: 0.5%;
  margin-bottom: 0.5%;
}

.center-div {
    box-shadow: 5px 5px black;
    padding: 20px;
    border-radius: 10px;
    border: 1px solid black;
    width: 70%;
    display: none;
}

h1 {
    text-align: center;
    text-shadow: 2px 2px black;
    font-size: 70px;
}

h2 {
    color: #333;
    padding-bottom: 5px;
    padding-left: 10px;
    text-decoration: underline;
}
.center-div .center-center-div {
    list-style-type: none;
    columns: 100px 3;
}
.center-div .center-center-div #items {
    margin-bottom: 10px;
    border: 2px solid black;
    border-radius: 15px;
    justify-content: space-between;
    padding: 0;
}
.center-div .center-center-div #items a {
    text-decoration: none;
    color: #1a73e8;
    margin-left: 1%;
}
.center-div .center-center-div #items a:hover {
    text-decoration: none;
}

.center-div .center-center-div #items i {
    margin-top: 3%;
    margin-right: 3%;
    margin-bottom: 3%;
    color: black;
}

#link1 {
  position: relative;
  display: inline-block;
}

#link1 .tooltiptext {
  visibility: hidden;
  background-color: #555;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 5px 0;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -60px;
  opacity: 0;
  transition: opacity 0.3s;
}

#link1 .tooltiptext::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #555 transparent transparent transparent;
}

#link1:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}

.icon-link {
    margin-right: 3%;
    color: black;
}