.index-header {
    max-width: 920px;
    margin: 0 auto;
}

.box-container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.box-link {
    text-decoration: none;
    display: block;
    flex-basis: calc(33.3333% - 20px);
}

.box {
    border: 2px solid black;
    border-radius: 15px;
    padding: 20px;
    margin: 10px;
    box-sizing: border-box;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    transition: all 0.3s ease;
    color: black;
    font-weight: bold;
    text-align: center;
}

.box:hover {
    transform: scale(1.02);
    opacity: 0.9;
}

.box1 {
    background: linear-gradient(45deg, #A0522D, #D2B48C); /* sienna to tan */
}

.box2 {
    background: linear-gradient(45deg, #556B2F, #ADFF2F); /* darkolivegreen to greenyellow */
}

.box3 {
    background: linear-gradient(45deg, #4682B4, #87CEEB); /* steelblue to skyblue */
}

@media screen and (max-width: 970px) {
    .box-link {
        flex: 1 1 100%;
    }
}