* {
    padding: 0;
    margin: 0;
}
.flex {
    display: flex;
}
.cloumn {
    flex-direction: column;
}
body {
    align-items: center;
    background-color: #f0f0f0;
    padding-top: 30px;
}
button {
    color: #000;
}
a {
    text-align: center;
    padding: 15px 0 15px 0;
    width: 94vw;
    /* border: 1px solid red; */
    background-color: #fff;
    margin-top: 20px;
    font-size: 1.6em;
    border-radius: 12px;
}
p {
    letter-spacing: 2px;
    font-size: 2.5em;
    margin-bottom: 10px;
}
.system {
    width: 94vw;
    border-radius: 5px;
    /* border: 1px solid red; */
    margin-top: 20px;
    padding: 10px 0 0 0;
    background-color: #fff;
}
.system .version {
    font-size: 1em;
    margin-left: 10px;
}