html, body {
    margin: 0;
}

.welcome {
    margin: 160px 0 0 0;
    font-size: 23px;
}

.instruction {
    display: flex;
    justify-content: center;
    flex-direction: column;
}

.idea {
    display: inline-block;
    background-color: rgba(252,240,240,0.5);
    margin: 150px;
    border-radius: 15px;
}

h1, 
h2,
p {
    text-align: center;
}