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                <a id="ya" href="">Yandex</a>

<select id="textColor">
  <option value="Green">Green</option>
  <option value="Red">Red</option>
  <option value="Blue">Blue</option>
  <option value="Black">Black</option>
<button onclick="setColor()">Set color</button><br>
<button onclick="toggleBig()">Toggle big/normal size</button>
<button onclick="toggleBorder('borderTop')">Border top</button>
<button onclick="toggleBorder('borderRight')">Border right</button>
<button onclick="toggleBorder('borderBottom')">Border bottom</button>
<button onclick="toggleBorder('borderLeft')">Border left</button>


                .colorGreen { color: green; }
.colorRed   { color: red; }
.colorBlue  { color: blue; }
.colorBlack { color: black; }

.sizeBig { font-size: 2rem; }
.borderTop    { border-top: 2px solid #000; }
.borderRight  { border-right: 2px solid #000; }
.borderBottom { border-bottom: 2px solid #000; }
.borderLeft   { border-left: 2px solid #000; }


                /* Задаём цвет текста в зависимости от выбраного из списка */
function setColor() {
  var textColor = document.getElementById("textColor");
  var val = textColor.value;
  var ya = document.getElementById("ya");

  ya.classList.remove("colorRed");//удалим все предыдущие
  ya.classList.remove("colorGreen");//несамый удачный вариант кода
  ya.classList.add("color" + val);

/* Включить/выключить большой размер текста */
function toggleBig() {
  var ya = document.getElementById("ya");

/* Красивый код. Рисуем рамку */
function toggleBorder(className) {