Olá Michele,
Você poderia tentar o seguinte código?
HTML (Removi os atributos width das imagens e adicionei uma classe wrap ao contêiner):
<div class="wrap custom-footer-image">
<a href="https://www.wur.nl/en.htm/"><img src="https://cdck-file-uploads-europe1.s3.dualstack.eu-west-1.amazonaws.com/standard21/uploads/fspm/original/1X/f2f2e6d11a09f6ceadecf437c48b24c8f44ea76d.png" alt="Footer Image"></a>
<a href="https://www.cirad.fr/en/"><img src="https://cdck-file-uploads-europe1.s3.dualstack.eu-west-1.amazonaws.com/standard21/uploads/fspm/original/1X/d0cf79c6442d594dc4efe3a009cd04c277f9bea8.png" alt="Footer Image"></a>
<a href="https://www.uni-goettingen.de/en/1.html/"><img src="https://cdck-file-uploads-europe1.s3.dualstack.eu-west-1.amazonaws.com/standard21/uploads/fspm/original/1X/0da449a3a30e30eaa4467e96189b7bd4e0a28a64.png" alt="Footer Image"></a>
<a href="http://algorithmicbotany.org/"><img src="https://cdck-file-uploads-europe1.s3.dualstack.eu-west-1.amazonaws.com/standard21/uploads/fspm/original/1X/27ca1fc832ecd29153d2ff150011e0dc056d4f93.png" alt="Footer Image"></a>
</div>
CSS:
.custom-footer-image {
display: flex;
justify-content: center;
align-items: center;
gap: 1rem;
a {
flex: 1;
text-align: center;
img {
max-width: 100%;
}
}
}
Como exibe no desktop:
No mobile:
O que você acha?
O layout mobile poderia ser alterado para duas colunas de duas imagens se elas ficarem muito pequenas em dispositivos móveis.