how to dynamically bind css attribute in vuejs code example

Example 1: vue inline style bind

<div v-bind:style="{ color: activeColor, fontSize: fontSize + 'px' }"></div>

Example 2: vue if echo class

<div class="defaultclass" :class="condition?' conditionalclasstoappend':''"></div>

Example 3: vue class binding

<div v-bind:class="[{ active: isActive }, errorClass]"></div>