* {box-sizing: border-box;}
.mytab{display: none;margin: 0px auto;}
.current{display: block;}

h1 {text-align: center; }

.previous {background-color: #bbbbbb; }

/* Make circles that indicate the steps of the form: */
.step {cursor: pointer; opacity: 0.8;}

.step.active {opacity: 1;}

.step.finish {background-color: #4CAF50; }

.error {color: #f00; }