html , body{
    height: 100%;
    width: 100%;
    margin: 0;
    border: 0;
    padding: 0;
    line-height: 1;
}


#search{
    font-size: 25px;
    width: 100%;
    height: 50px;
    text-align: center;
    background-color: #88d6ff;
    margin: 0;
    border: 0;
    padding-top: 20px;
}

pre{
    width: 100%;
    margin: 0;
    border: 0;
    padding: 0;
}

a{
    color: black;
    transition: color 200ms ease 0s;
}

a:hover{
    color: red;
}



.fill{
    width: 100%;
    height: 30%;
    margin-bottom: 5%;
    margin-top: 2%;
}

.introduce1{
    margin-right: 5%;
    font-size: 120%;
    padding-top: 2%;
    box-sizing: border-box;
    text-indent: 2em;
    line-height: 1.5em;
}

.introduce2{
    margin-left: 5%;
    font-size: 120%;
    padding-top: 2%;
    box-sizing: border-box;
    text-indent: 2em;
    line-height: 1.5em;
}


.animation{
    width: 100%;
    height: 30%;
    margin-bottom: 5%;
    margin-top: 2%;
    opacity: 0;
    transition: opacity 1s ease 0s;
}