Use rule transform: translateX() for hover, and preferably for default. Also, make the span block using rule display: inline-block.

.container-fluid .blue-row {
    background-color: #03a9f4;
    width: 100%;
    margin: auto;
}

.container-fluid .blue-row h3 {
    color: white;
    font-size: 39px;
    text-align: center;
    vertical-align: center;
    padding: 40px;
    font-weight: bold;
}

.container-fluid .blue-row h3 span {
    display: inline-block;
    transform: translateX(20%);
    transition: 1s;
}

.container-fluid .blue-row:hover > h3 span {
    transform: translateX(50%);
}

<div class="container-fluid">
    <div class="blue-row">
        <h3>Check how we can kickstart your smart projects<span>&#10230;</span></h3>
    </div>
</div>