body {
    background-color: lightgrey;
    font-family: Arial, Helvetica, sans-serif;
    color: #333;
}

.absolute-center {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    position: absolute;
}

.collapsible {
    cursor: pointer;
    padding: 0 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0px 0px 10px 5px rgba(0, 0, 0, 0.1);
    width: 450px;
    overflow: hidden;
}

.heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#arrow {
    font-size: 1.4em;
    transition: transform 300ms;
}

.title {
    font-size: 1.4em;
    font-weight: bold;
    padding-top: 15px;
    padding-bottom: 15px;
    display: block;
}

.paragraph {
    transition: max-height 300ms ease-out;
    max-height: 0;
    line-height: 20px;
}

@media (max-width: 486px) {
    .collapsible {
        width: 300px;
    }
}