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

#mid {
    width: 60%;
    margin: 0 auto;
    position: absolute;
    z-index: -1;
    left: 0;
    right: 0;
}

.alert {
    padding-left: 3rem;
    padding-right: 3rem;
    padding-top: 1rem;
    padding-bottom: 1rem;
    background-color: #f44336;
    color: white;
    margin-bottom: 15px;
    transition: opacity 0.3s, visibility 0.3s, max-height 0.3s, margin-bottom 0.3s;
    opacity: 1;
    visibility: visible;
    max-height: 500px;
    overflow: hidden;
}

.alert p {
    margin: 0;
}

.closebtn {
    margin-left: 15px;
    color: white;
    font-weight: bold;
    float: right;
    font-size: 22px;
    line-height: 20px;
    cursor: pointer;
    transition: 0.3s;
}

.closebtn:hover {
    color: black;
}

#closeAlert:checked ~ .alert {
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    margin-bottom: 0;
    padding: 0;
}