.box1 {
    background-color: black;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
p {
    font-size: 17px;
    align-items: center;
}
.box1 a {
    display: inline-block;
    background-color: #fff;
    padding: 15px;
    border-radius: 3px;
}
.modal1 {
    align-items: center;
    display: flex;
    justify-content: center; 
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    transition: all 0.4s;
    visibility: hidden;
    opacity: 0;
}
.content1 {
    position: absolute;
    background: white;
    width: 400px;
    padding: 1em 2em;
    border-radius: 4px;
} 
.modal1:target {
    visibility: visible;
    opacity: 1;
}
.box-close1 {
    position: absolute;
    top: 0;
    right: 15px;
    color: #fe0606;
    text-decoration: none;
    font-size: 30px;
}