body {
 font-family: Arial, sans-serif;
    height: 100vh;
}

h1 {
    text-align: center;
    font-family: Tahoma, Arial, sans-serif;
    color: #06D85F;
    margin: 80px;
}

.box {
    width: 50%;
    margin: 10% auto;
    background: rgba(255,255,255,0.2);
    padding: 35px;
    border: 2px solid Black;
    border-radius: 20px/50px;
    background-clip: padding-box;
    text-align: center;
}

.button {
    font-size: 1em;
    padding: 10px;
    color: #fff;
    border: 2px solid #06D85F;
    border-radius: 20px/50px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease-out;
}

    .button:hover {
        background: #06D85F;
    }

.overlay {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    transition: opacity 500ms;
    visibility: hidden;
    opacity: 0;
}

    .overlay:target {
        visibility: visible;
        opacity: 1;
    }

.popup {
    margin: 120px auto;
    padding: 10px;
    background: #fff;
    border-radius: 5px;
    width: 30%;
    position: relative;
    transition: all 5s ease-in-out;
}

    .popup h2 {
        margin-top: 0;
        color: #333;
        font-family: Tahoma, Arial, sans-serif;
    }

    .popup .close {
        position: absolute;
        top: -25px;
        right: -47px;
        transition: all 200ms;
        font-size: 20px;
        font-weight: bold;
        text-decoration: none;
        color: white;
    }

        .popup .close:hover {
            color: #06D85F;
        }

    .popup .content {
        max-height: 20%;
        overflow: auto;
    }

@media screen and (max-width: 700px) {
    .box {
        width: 100%;
    }

    .popup {
        width: 100%;
    }
}
body {
    background: offwhite;
    font-family: Arial, sans-serif;
    text-align: center;
}

button {
    margin-top: 50px;
    background-color: rgba(255,255,255,0.3);
    border: 3px solid #F04A49;
    color: #F04A49;
    font-size: 25px;
    padding: 10px 20px;
}

    button:hover {
        background-color: #F04A49;
        color: #FFF;
        border: 3px solid #F04A49;
        transition: all 0.3s ease 0s;
    }

p {
    margin: 1em 0;
    font-size: 20px;
}