@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@500&display=swap');
*{
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: Poppins;
}
body
{
    background-image: url(img/wallpaper.jpeg);
    background-size: 2000px;
}
header
{
    z-index: 999;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 200px;
    transition: 0.5s ease;
}
header .brand
{
    color: rgb(124, 255, 124);
    font-size: 1.6em;
    font-weight: 800;
    text-decoration: none;
}
header .navigation
{
    position: relative;
}
header .navigation .navigation-items a
{
    position: relative;
    color: #fff;
    font-size: 1em;
    font-weight: 600;
    text-decoration: none;
    margin-left: 40px;
    transition: 0.3s ease;
}

header .navigation .navigation-items a::before
{
    content: '';
    position: absolute;
    background: rgb(0, 255, 115);
    width: 0;
    height: 2.9px;
    bottom: 0;
    left: 0;
    transition: 0.3s ease;
}
header .navigation .navigation-items a:hover:before
{
    width: 100%;
}
.hello h1
{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    font-size: 5em;
    color: aqua;
    text-shadow: 0px 1px 13px rgba(0,0,0,0.3);
    opacity: 1;
    animation-name: welcome;
    animation-duration: 2s;
    transform: translate(-50%, -200%)
}
.p p
{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    font-size: 1.5em;
    color: rgb(255, 255, 255);
    text-shadow: 0px 1px 13px rgba(0,0,0,0.3);
    opacity: 1;
    text-align: center;
    font-family: Noto Sans JP;
    animation-name: hello;
    animation-duration: 3s;
    transform: translate(-50%, -50%)
    
}

.p button
{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    font-size: 1.5em;
    color: rgb(0, 0, 0);
    font-family: Noto Sans JP;
    width: 300px;
    height: 70px;
    border: none;
    background: #fff;
    border-radius: 30px;
    animation-name: ohno;
    animation-duration: 2s;
    transition: .8s;
    transform: translate(-50%, 200%);
}
.p button:hover
{
    background-color: #ddd;
}
@keyframes welcome
{
    0% {
        opacity: 0;
        position: absolute;
        top: 50%;
        left: 50%;
        margin-right: -50%;
        transform: translate(-50%, -50%)
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 1;
    }
}
@keyframes hello
{
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}
@keyframes ohno
{
    0% {
        opacity: 0;
        position: absolute;
        top: 50%;
        left: 50%;
        margin-right: -50%;
        font-size: 1.5em;
        color: rgb(0, 0, 0);
        font-family: Noto Sans JP;
        width: 300px;
        height: 70px;
        border: none;
        background: rgb(255, 0, 157);
        border-radius: 20px;
        animation-name: ohno;
        animation-duration: 2s;
        transform: translate(-50%, 2%);
    }
}