button {
        background-color: #4CAF50;
        color: #ffffff;
        border: none;
        padding: 10px 20px;
        font-size: 17px;
        font-family: Raleway;
        cursor: pointer;
        margin-right: 50px;;
    }
    button:hover {
        opacity: 0.8;
    }
    

  
  /* Mark input boxes that gets an error on validation: */
  input.invalid {
    background-color: #ffdddd;
}

/* Hide all steps by default: */
.tab {
    display: none;
}
    #prevBtn {
        background-color: #bbbbbb;
    }

    /* Make circles that indicate the steps of the form: */
    .step {
        height: 15px;
        width: 15px;
        margin: 0 2px;
        background-color: #bbbbbb;
        border: none;
        border-radius: 50%;
        display: inline-block;
        opacity: 0.9;
    }

    .step.active {
        opacity: 1;
    }

    /* Mark the steps that are finished and valid: */
    .step.finish {
        background-color: #4CAF50;
    }