* {box-sizing: border-box;}
.tab{display: none; height: 50%;margin: 0px auto;}
.current{display: block;}

form {background-color: #ffffff; font-family: Raleway; padding: 40px; width: 50%; min-width: 300px; }

h1 {text-align: center; }

input {padding: 10px; width: 100%; font-size: 17px; font-family: Raleway; border: 1px solid #4CAF50; }

button {background-color: #4CAF50; color: #ffffff; border: none; padding: 10px 10px; font-size: 17px; font-family: Raleway; cursor: pointer; }

button:hover {opacity: 0.8; }

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

/* Make circles that indicate the steps of the form: */
.step {height: 30px; width: 30px; cursor: pointer; margin: 0 2px; color: #fff; background-color: #4CAF50; border: none; border-radius: 50%; display: inline-block; opacity: 0.8; padding: 5px}

.step.active {opacity: 1; background-color: #4CAF50;}

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

.error {color: #f00; }