input[type="checkbox"] {
  position: absolute;
  left: -9999px;
}

.msgtxt {
        margin: 100px;
}

.side-label {
  display: block;
  position: relative;
  margin: 10px 0;
  padding-left: 35px;
  cursor: pointer;
}

.side-label::before, .side-label::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
}

.side-label::before {
  display: block;
  width: 15px;
  height: 15px;
  border: 2px solid black;
}

.side-label::after {
  display: none;
  width: 11px;
  height: 11px;
  margin: 4px;
  background-color: red;
}

input:checked + .side-label::after {
  display: block;
}

.blocked {
    background-color: #f44336;
    color: white;
    padding: 14px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    line-height: 14px;
    font-size: 12px;
    margin: 0 auto;
}

.linkcst {
  display: none;
}

#permitted:checked ~ .blocked {
  display: none;
}

#permitted:checked ~ .linkcst {
  display: block;