CSS transition funktioniert nicht

Hallo Profis, Fans und Bastler! Ich möchte den CSS-Transition-Effekt bei hover nutzen; das klappt aber nicht. Wer hätte eine Idee?

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     <style>
   body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,   
        "Helvetica Neue", Helvetica, Arial, sans-serif;       
    line-height: 1.5;
    text-align: center;
    background: #fbf9f3;
    max-width: 600px;
    padding: 1rem;
    margin: 1rem auto;
}
        
.button-primary, .button-secondary {
    display: inline-block;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 1rem;
    margin-top: 1rem;
}
        
.button-primary {
    background: steelblue;
    color: white;
    margin-right: 2rem;
}
        
.button-secondary {
    background: transparent;
    color: steelblue;
    border: 2px solid steelblue;
}
        
.button-primary:hover, .button-primary:focus {
    background-color: #b4464b;
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