.introduction {
    padding: 30px;
    margin: 0 auto 30px auto;
    width: 95%;
    border: 2px #777 solid;
}
main {
    padding: 40px;
}
p {
    font-size: 18px;
    margin: 30px 0;
}
.two-column{
    display: flex;
}

.left, .right {
    margin-top: 20px;
    width: 50%;
    padding: 25px;
    padding-top: 0;
    box-sizing: border-box;
}
.left {
    border-right: 3px dashed #777;
}

.title {
    font-size: 30px;
}

.container .title{
    font-size: 35px;
}

h2.sub-title {
    margin-bottom: 10px;
    font-size: 25px;
}

ul {
    margin-left: 15px;
    margin-top: 5px;
}

.color-marker {
    background: linear-gradient(transparent 70%, #69d46d 30%);
    font-weight: bold;
}

.main {
    margin: 0 auto 20px auto;
    width: 95%;
    margin-bottom: 20vh;
}

.left-containers, .right-containers {
    width: 50%;
}

.left-containers {
    margin-right: 10px;
}

.right-containers {
    margin-left: 10px;
}

.main-container {
    background-color: #fff;
    padding: 20px;
    margin-bottom: 30px;
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.4s ease;
}
.main-container:not(.not-available) {
    cursor: pointer;
}
.main-container:not(.not-available):hover {
    transform: translateY(-15px);
    background-color: #ddd;
}
.main-image {
    max-width: 100%;
    width: 500px;
    height: auto;
    opacity: 0.5;
    display: block;
    margin: 20px auto 0 auto;
    transition: opacity 0.5s;
}
.main-text {
    margin-top: 10px;
}
.main-container:hover .main-image {
    opacity: 1;
}
.main-container:hover .main-text {
    opacity: 1;
}
.chat-meta {
    font-size: 0.8em;
    color: #888;
    margin-top: 2px;
  }
  

@media (max-width: 768px) {
    .two-column {
        display: block;
    }
    .main {
        margin-top: 60px;
    }
    .left {
        border: none;
        border-bottom: 2px dashed black;
    }
    .left,
    .right,
    .left-containers,
    .right-containers {
        width: 100%;
    }
    .right-containers,
    .left-containers {
        margin: 0;
    }
}