body {
    font-family: 'Open Sans Condensed', 'Noto Sans JP', sans-serif;
    color: #fff;
    background: #000;
    border: 0;
    padding: 0 20px;
    margin: 40px auto;
    max-width: 900px;
    width: 100%;
    box-sizing: border-box;
}

h1, p {
    width: 100%;
}


h1 {
    font-size: 50px;
    margin: auto auto 20px auto;
    padding: auto;
    width: 900px;
}

p {
    font-size: 16px;
    margin: auto;
    line-height: 50px;
    width: 900px;
}

form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    width: 100%;
}

#passbtn {
    font-family: "Zen Kaku Gothic New", sans-serif;
    position: relative;
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin: 20px auto;
    max-width: 200px;
    padding: 10px 25px;
    color: #fff;
    background-color: #24282e;
    transition: 0.3s ease-in-out;
    font-weight: 600;
    border: none;
}

#passbtn:before {
    position: absolute;
    bottom: 0px;
    left: 50%;
    content: '';
    width: 100%;
    height: 2px;
    transform: translateX(-50%);
}

#passbtn:after {
    position: absolute;
    bottom: 0px;
    left: 0;
    content: '';
    width: 100%;
    height: 2px;
    background: #d4831a;
    transform: scale(0, 1);
    transform-origin: left top;
    transition: transform .3s;
}

#passbtn:hover {
    opacity: 0.7;
}

#passbtn:hover:after {
    transform: scale(1, 1);
}

#pass {
    width: 100%;
    max-width: 500px;
    padding: 8px 10px;
    border: none;
    background-color: #24282e;
    color: #e5e5e5;
    font-size: 1em;
    line-height: 1.5;
    height: 50px;
    resize: none;
}

#pass:focus {
    outline: 1px solid #fff;
}


#pass::placeholder {
    color: rgba(255,255,255,.5);
}