* {
  box-sizing: border-box;
}

.centerb {width:512px; text-align:center; margin-left:auto;margin-right:auto;}

.row {
  display: flex;
  width:300px;
  text-align:center;
  margin-left:auto;margin-right:auto;}



.column {
  flex: 50%;
  padding: 5px;
}



.icon-bar {
  width: 100%;
  background-color: #555;
  overflow: auto;
}

.icon-bar a {
  float: left;
  width: 20%;
  text-align: center;
  padding: 12px 0;
  transition: all 0.3s ease;
  color: white;
  font-size: 25px;
}

.icon-bar a:hover {
  background-color: #000;
}

.active {
  background-color: #4CAF50;
}

.facebook {
  background: #3B5998;
  color: white;
}

.twitter {
  background: #55ACEE;
  color: white;
}

.google {
  background: #dd4b39;
  color: white;
}

.linkedin {
  background: #007bb5;
  color: white;
}

.whatsapp {
  background: #25D366;
  color: white;
}


[class*="centerb"] {
  width: 100%;
}

@media only screen and (min-width: 768px) {
  .centerb {width: 512px;}
}

[class*="row"] {
  width: 100%;
}

@media only screen and (min-width: 768px) {
  /* For desktop: */
  .row {width: 512px;}
}


/* Style the tab */
.tab {
  overflow: hidden;
  border: 1px solid #ccc;
  background-color: #B13E3B;;
}

/* Style the buttons inside the tab */
.tab button {
  background-color: inherit;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 10px 10px;
  transition: 0.3s;
  font-size: 12px;
}

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

/* Create an active/current tablink class */
.tab button.active {
  background-color: #555;
}

/* Style the tab content */
.tabcontent {
  display: none;
  padding: 14px 16px;
  border: 1px solid #ccc;
  border-top: none;
}