body {
    background-color: black;
    color: aliceblue;
    font-family: Georgia, 'Times New Roman', Times, serif;
    font-size: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: url('back_picture.jpg');
    background-repeat: repeat-y;
    background-position: left;
    background-size: cover;
    width: 90vw;
    height: 90vh;
    position: relative;
    left: 5vw;
    
}

h1 {
    font-style: italic;
    color: white;
    text-align: center;
}

h3 {
    text-decoration: underline;
    color: rgb(255, 255, 255);
    
}
a {
    color: black;
    font-weight: bold;
    text-decoration: none;
    background-color: rgba(240, 248, 255, 0.4);
    border: 1px dotted black;
}

img {
    
    margin: 20px;
}


ul {
    list-style: none;
    display: flex;
    padding: 0;
    margin: 0;
    width: 70vw;
    background-image: linear-gradient(to right, rgba(159, 227, 248, 0.4) , rgba(255, 157, 181, 0.4));
    flex-wrap: wrap;
    cursor: pointer;
    border-radius: 10px;
}


li{
   color: black;
   padding: 1em;
   flex-basis: 0;
   flex-grow: 1;
   text-align: center;
   text-decoration: underline;
}


li:hover {
    background-color: rgb(98, 98, 240);
    transition: background-color;
    transition-duration: 0.25s;
    border-radius: 10px;
}
a:hover {
   background-color: rgb(141, 141, 241);
}

.intro {
    width: 70vw;
    text-indent: 1em;
    text-align: justify;
    text-justify: inter-word;
}
  
 .papers {
     display: grid;
     width: 70vw;
 }

 p {
     display: flex;
     justify-content: space-between;
     margin-top: 15px;
     margin-bottom: 15px;
 }
 p > a {
     color: white;
     background-color: transparent;
     border: none;
     text-shadow: 1px 1px #7d7dfc;
 }

 p > a:hover {
     color: yellow;
     background-color: transparent;
 }

 span {
     font-style: italic;
 }
 time {
     color: rgb(255, 0, 0);
     text-shadow: 1px 1px #f58aa5;
 }
 .subject {
     margin-bottom: 30px;
 }

 @media (max-width: 700px) {
    .topbar {
      display: flex;
      justify-content: center;
      font-size: 24px;
    }
  
    ul {
      flex-direction: column;
      width: fit-content;
    }
  
    .welcome-title {
      font-size: 15px;
    }

    h1 {
        font-size: 24px;
    }
    h3 {
        font-size: 24px;
    }
    .papers {
        font-size: 24px;
    }
}