CSS need help

body {
    background-color: #070000;
    font-family: "Audiowide", sans-serif;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    color: #d00f0f;

#containeraddons {
    display:grid;
    grid-template-columns: repeat(auto-fit, minmax(430px, 1fr));
    gap: 20px;
    margin: 20px;
    max-width: 100%;
    justify-self: center;

}

.addons {
    width: 100%;
    max-width: 400px;
    border: double;
    position:relative;

}
.addons img {
    margin-top: 20px;
}