.panel-logo {
    background-image: url('data:image/jpeg;base64,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'); /* ваш Base64 код */
    background-size: contain;
    background-repeat: no-repeat;
    width: 40px; /* укажите нужные размеры */
    height: 40px;
    display: inline-block;
}