:root {
    --firstColor: #ffff;  
    /*--firstColor: #68b0aa;*/  
}
main {
  max-width: 800px;
  padding: 40px;
  border: 1px solid rgba(0,0,0,.2);
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,.1);
}

section {
  display: none;
  
  /*border-top: 1px solid #abc;*/
}

 

label {
  
  margin: 0 0 -1px;
 
  font-weight: 600;
  text-align: center;
  /*color: #abc;*/
  border: 1px solid transparent;
}

 

 
label[for*='3']:before { content: '\f16c'; }
label[for*='4']:before { content: '\f171'; }

/*label:hover {
  color: #789;
  cursor: pointer;
}*/

input:checked + label {
  color: var(--firstColor);
  border: 1px solid #abc;
  border-top: 2px solid var(--firstColor);
  border-bottom: 1px solid #fff;
}

label:before {
  font-family: fontawesome;
  font-weight: normal;
  margin-right: 10px;
}
#tab1:checked ~ #content1,
#tab2:checked ~ #content2,
#tab3:checked ~ #content3,
#tab4:checked ~ #content4 {
  display: block;
}