* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #f1f5f8;
    font-family: 'Noto Sans JP', sans-serif;
}

nav h2 {
    padding-left: 2rem;
}

nav div p {
    height: 3rem;
}

a p {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 1rem 1rem 1rem 0;
    
}

nav div a p:hover {
    transition: .8s;
    background-color: #dcefff;
}

a {
    text-decoration: none;
    color: inherit;
}

iframe {
    width: 100%;
    margin-bottom: 5rem;
}


/* Classes */

.main {
    display: flex;
    justify-content: center;
    flex-direction: column;
    height: 100vh;
}

.pass {
    border: 8px solid #c2c2c2;
    border-radius: 2rem;
    padding: 2rem;
    align-self: center;
}

.sidebar {
    background-color: #6cbdff;
    padding: 1rem 1rem 1rem 0;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.content {
    padding: 2rem;
    height: 100vh;
    overflow: scroll;
}

.navbar-collapse {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-left: 2rem;
}

.file-display {
    text-align: center;
}

.btn {
    width: 100%;
    color: black;
}

.btn-primary {
    background-color: #6cbdff;
    border-color: #6cbdff;
}

.btn-primary:hover {
    background-color: #3ea8ff;
    border-color: #3ea8ff;
    color: black;
}

.card {
    margin-bottom: 2rem;
    border-width: 2px;
}

.card-img-top {
    padding: 1rem;
    width: 100%;
}

.chapter {
    background-color: #6cbdff;
    margin: 1rem 2rem 1rem 2rem;
    height: 10rem;
    font-weight: 800;
    transition: .3s;
}

.chapter:hover {
    transform: scale(1.1);
    background-color: #3ea8ff;
}

/* Media screen */

@media (max-width:767px) {
    nav h2 {text-align: center; padding-left: 1rem;}
}