style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    font-weight: 400;
    font-size: 14px;
}

.content {
    width: 500px;
    padding: 20px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.content-title {
    margin-bottom: 10px;
}

.image {
    width: 100%;
    border-radius: 5px;
    margin-bottom: 10px;
}

p {
    text-align: justify;
    margin-bottom: 20px;
}

.popup-btn {
    border: 0;
    background-color: black;
    color: white;
    font-family: inherit;
    font-weight: inherit;
    padding: 10px 35px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s linear;
}

.popup-btn:hover,
.close:hover {
    box-shadow: 0 0 0.325rem black;
}

.popup-model {
    width: 300px;
    padding: 20px;
    background-color: whitesmoke;
    border-radius: 5px;
    box-shadow: 0 0 0.325rem whitesmoke;
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
    visibility: collapse;
    transition: 0.15s;
}

.model-title {
    text-align: center;
    margin-bottom: 1rem;
}

.close {
    width: 100%;
    padding: 10px;
    background-color: black;
    color: white;
    cursor: pointer;
    font-family: inherit;
    font-weight: inherit;
    border-radius: 5px;
}

.content-active {
    filter: blur(5px);
    transition: 0.3s;
}

.popup-model-active {
    top: 43%;
    visibility: visible;
    transition: 0.3s;
}