<div>
   <button>Buscar con Google</button>
</div>
<div>
   <button>Me siento con suerte</button>
</div>

main .main-buttons {
    width: 530px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

main .main-buttons button {
    height: 36px;
    background-color: #f2f2f2;
    border: 1px solid #f2f2f2;
    font-size: 14px;
    color: #5f6368;
    border-radius: 5px;
    padding: 0 15px;
    margin-right: 15px;
}

main .main-buttons button:hover {
    border: 1px solid #c6c6c6;
    box-shadow: 0 1px 1px #a5a5b4;
    color: #222;
    cursor: pointer;
}