ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    border: 1px solid #e7e7e7;
    background-color: #f3f3f3;
}

li {
    float: left;
}

li a {
    display: block;
    color: black;
    text-align: center!;
    padding: 20px 20px;
    text-decoration: none !important;
}

li a:hover:not(.active) {
    background-color: red;
}

li a.active {
    color: white !important;
    background-color: blue;
}
.pesquisa{
  margin: auto;
  width: 50%;
  background: #fff;
  border: 3px solid black;
  padding: 50px;
  margin-top: 3em;
  padding-top: 3em !important;
}
h3{
  text-align: center;
}
h4{
  text-align: center;
}
.card1{
  float: left;
  border: 3px solid red;
  width: 30%;
  height: 200px;
  margin-top: 5em;

}
.card2{
  margin: auto;
  width: 30%;
  height: 200px;
  background: #fff;
  border: 3px solid red;
  margin-top: 5em;
  padding-top: 3em !important;s
}
.card3{
  float: right;
  border: 3px solid red;
  width: 30%;
  height: 200px;
  margin-top: 5em;
  margin-left: 2em;
}
.btn{
  float: right!important;
  margin-top: 10px;
  margin-right: 5px;
}