DIV Container einheitliche Höhe

<div class="index-items">  
                    <img src="uploads/iconmonstr-car-3-120.png" class="index-image" alt="Bild" />  
                    <div class="footer">  
                         <label>EU-Neuwagen-Beschaffung</label>
                     </div>
                 </div>

.index-items {
        display: inline-block;
        width: 25%;
        padding-top: 40px;
        border: 1px solid #818181;
        height: 25%;
        background-color: #212121;
        margin-top: 40px;
        margin-right: 40px;
    }
    .index-items:hover {
        border: 1px solid yellow;
    }
    .footer {
        text-align: center;
        bottom: 0;
        color: yellow;
    }
    .footer label {
        padding-left: 10px;
        padding-right: 10px;
    }

    .index-image {
        margin: auto;
        display: block;
        width: 28%;
    }