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

body {
  padding: 0, 0, 0;
  font-family: 'Poppins', sans-serif;
  background: #f1f1f1;
  background: url("../img/email-pattern.webp");
}

.container{
  margin: 0;
}
 /* Style the tab */
.tab {
  overflow: hidden;
  border: 1px solid #ccc;
  background-color: #f1f1f1;
}

/* Style the buttons that are used to open the tab content */
.tab button {
  background-color: inherit;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  transition: 0.3s;
}

/* Change background color of buttons on hover */
.tab button:hover {
  background-color: #ddd;
}

/* Create an active/current tablink class */
.tab button.active {
  background-color: #ccc;
}

/* Style the tab content */
.tabcontent {
  display: none;
  padding: 6px 12px;
  border: 1px solid #ccc;
  border-top: none;
} 
.tabcontent {
  animation: fadeEffect 1s; /* Fading effect takes 1 second */
}

/* Go from zero to full opacity */
@keyframes fadeEffect {
  from {opacity: 0;}
  to {opacity: 1;}
}
img, h1{
  display:inline-block;
  }

  #nivel{
    background-color:yellow;
    }

    .headt td {
      min-width: 235px;
      height: 100px;
      background-color: #433;
    }