body {
    margin: 0;
    font-family: Arial, sans-serif;
}

.index {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    background: #ffffff;
    position: relative;
}

.center-image {
    width: 50%;      
    max-width: 500px; 
    height: auto;
}

.box {
    position: absolute;
    text-align: center;
    font-size: 2vw;  
    color: blue;
    text-decoration: underline;
}

.box-top {
    top: 21%;
    left:50%;
    transform: translateX(-50%);
}

.box-bottom {
    bottom: 41%;
    left: 39%;
    transform: translateX(-50%);
}

.box-left {
    top: 29%;
    left: 37%;
    transform: translateY(-50%);
}

.box-right {
    top: 32%;
    right: 38%;
    transform: translateY(-50%);
}

.box-top-right {
    top: 41%;
    right: 36%;
}

.box-bottom-right {
    bottom: 41%;
    right: 35%;
}


a {
    color: blue;
    text-decoration: none;
}

a:visited {
    color: blue;
}

@media (max-width: 768px) {
    .box {
        font-size: 3vw;
    }
    .center-image {
        width: 70%;
    }
}