<div class="wrapper">

  <h1>Accordion Menu + Tooltip</h1>

  <div class="wrap-1">
    <input type="radio" id="tab-1" name="tabs">
    <label for="tab-1"><div>tab one</div><div class="cross"></div></label>
    <div class="content">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia autem quasi inventore unde nobis voluptatibus illum quae rerum laudantium minima, excepturi quis maiores. Eaque quae, nam delectus explicabo, deserunt ipsum!</div>
  </div>

  <div class="wrap-2">
    <input type="radio" id="tab-2" name="tabs">
    <label for="tab-2"><div>tab two</div><div class="cross"></div></label>
    <div class="content">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Mollitia autem quasi inventore unde nobis voluptatibus illum quae rerum laudantium minima, excepturi quis maiores. Eaque quae, nam delectus <span class="tip" data-tip="Eaque quae, nam delectus explicabo, deserunt ipsum!">explicabo</span>,
      deserunt ipsum! Lorem ipsum dolor sit amet, consectetur adipisicing elit. <span class="tip" data-tip="Lorem ipsum dolor sit amet, consectetur adipisicing elit.">Mollitia</span> autem quasi inventore unde nobis voluptatibus illum quae rerum laudantium
      minima, excepturi quis maiores. Eaque quae, nam delectus explicabo, <span class="tip" data-tip="Lorem ipsum dolor sit amet.">deserunt</span> ipsum!</div>
  </div>

  <div class="wrap-3">
    <input type="radio" id="tab-3" name="tabs">
    <label for="tab-3"><div>tab three</div><div class="cross"></div></label>
    <div class="questions">
      <div class="question-wrap">
        <input type="radio" id="question-1" name="question">
        <label for="question-1"><div>question one</div> <div class="cross"></div></label>
        <div class="content">
          Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ipsam atque, soluta doloribus distinctio saepe labore voluptates facere illum alias perferendis praesentium quia vel accusamus incidunt corporis veniam sapiente. Voluptate, quasi.
        </div>
      </div>
      <div class="question-wrap">
        <input type="radio" id="question-2" name="question">
        <label for="question-2"><div>question two</div> <div class="cross"></div></label>
        <div class="content">
          Ipsam atque, soluta doloribus distinctio saepe labore voluptates facere illum alias perferendis praesentium quia vel accusamus incidunt corporis veniam sapiente. Voluptate, quasi.
        </div>
      </div>
    </div>
  </div>
</div>

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: 'Space Mono', monospace;
    color: #3E474F;
}

body {
  overflow: hidden;
}

.wrapper {
    max-width: 600px;
    width: 100%;
    margin: 10vh auto;
}

h1 {
    font-size: 2em;
    margin-bottom: 20px;
    text-align:center;
}

input {
    display: none;
}

label {
    display: flex;
    width: 100%;
    height: 50px;
    cursor: pointer;
    border: 3px solid #3E474F;
    user-select: none;
}

label div:first-child {
    width: 100%;
    line-height: 45px;
    margin-left: 10px;
    font-size: 1.2em;
}

.cross{
    margin-right:15px;
    margin-top:3px;
}

.cross:before,.cross:after {
    content: '';
    border-top: 2px solid #3E474F;
    width: 15px;
    display: block;
    margin-top: 18px;
    transition: 0.3s;
}

.cross:after {
    transform: rotate(90deg);
    margin-top: -2px;
}

.content {
    box-sizing: border-box;
    font-size: 0.9em;
    margin: 10px 10px;
    max-height: 0;
    overflow: hidden;
    transition: max-height, .5s;
}

input:checked ~ .content {
    max-height: 400px;
    transition: max-height, 1s;
}

input:checked ~ label .cross:before {
    transform: rotate(180deg);
}

input:checked ~ label .cross:after {
    transform: rotate(0deg);
}

.questions{
    margin-top:20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height, .5s;
}

.questions label{
    border:none;
    box-shadow: none;
    margin:0;
}

input:checked ~ .questions {
    max-height: 400px;
    border-bottom:2px solid #3E474F;
    transition: 1s;
}

/*----------tool-tip------------*/

.tip {
    color: #f03768;
    cursor: help;
    position: relative;
    overflow: visible;
    font-family: monospace;
    font-size: 1.3em;
}

.tip:before,
.tip:after {
    position: absolute;
    opacity: 0;
    z-index: -100;    
    transform: translateY(-30%);
    transition: .4s;
}

.tip:before {
    content: '';
    border-style: solid;
    border-width: 0.8em 0.5em 0 0.5em;
    border-color: #3E474F transparent transparent transparent;
    transform: translateY(-200%);
    bottom:90%;
    left:50%;
}

.tip:after {
    content: attr(data-tip);
    background: #3E474F;
    color: white;
    width: 150px;
    padding: 10px;
    font-size: 0.8em;
    bottom: 150%;
    left: -50%;
}

.tip:hover:before,
.tip:hover:after {
    opacity: 1;
    z-index: 100;
    transform: scaleY(1);
}

// no JS required