/* Extra small devices (phones, less than 768px) */
body {
    margin: 0;
    padding: 0;
    font-family: 'Domine';
}
h1 {
    text-align: center;
    font-size: 40px;
    font-weight: normal;
}
p {
    text-align: left;
    font-size: 20px;
    line-height: 1.6;
}
li {
    text-align: left;
    font-size: 20px;
    line-height: 1.6;
}

/* Button */
.button_container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 40px;
}
.button {
    width: 200px;
    border: none;
    color: white;
    margin: 10px 20px;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 20px;
    border-radius: 10px;
}

/* Tooltip */
.tooltip {
    position: relative;
    display: inline-block;
}
.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 5px;
    border-radius: 6px;
    font-size: 16px;
    position: absolute;
    z-index: 1;
    top: 100%;
    left: 50%;
    margin-left: -100px;
}
.tooltip:hover .tooltiptext {
    visibility: visible;
}

/* Video */
video {
    display: block;
    margin: 5% auto;
    width: 320px;
    height: 180px;
}

/* Text */
#heading {
    color: #003F83;
    margin-top: 10%;
}
.textbox {
    padding: 0 10% 0 10%;
}

/* Diagram */
.img_pss {
    display: block;
    margin: 5% auto;
    width: 300px;
}

/* Small devices (tablets, 768px and up) */
@media (min-width: 768px) {
    video {
        width: 640px;
        height: 360px;
    }
    .img_pss {
        width: 600px;
    }
}

/* Medium devices (desktops, 992px and up) */
@media (min-width: 992px) {

}

/* Large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    video {
        width: 1024px;
        height: 576px;
    }
    #heading {
        margin-top: 5%;
    }
    .textbox {
        padding-left: 15%;
        padding-right: 15%;
    }
    .img_pss {
        width: 800px;
    }
}

/* Largest devices (standard desktops, 1920px and up) */
@media (min-width: 1920px) {
    .img_pss {
        width: 1200px;
    }
}