VitalyDmi

table {
   border-spacing: 0;
}

tr:nth-child(odd) {
  background-color: #E7E7E7;
}

td, th {
  text-align: center;
  padding: 15px;
}

let phrases = ['банан', 'яблоко', 'апельсин', 'киви'];
phrases[Math.floor(Math.random() * phrases.length)]; // рандомный элемент

.....
$('#fruits-btn').on({
.....
<div style="text-align: center;"><button id="fruits-btn" class="rnd-word yellow">Фрукт</button>

.....
$('#phone-btn').on({
.....
<div style="text-align: center;"><button id="phone-btn" class="rnd-word yellow">Телефон</button>