* {
    margin: 0;
    padding: 0;
}

.body-container {
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
    line-height: 1.6;
}

.secondary-btn {
    animation: breath 2s infinite;
    cursor: pointer
}

@keyframes breath {
    0% {
        transform: scale(1)
    }

    50% {
        transform: scale(1.1)
    }

    to {
        transform: scale(1)
    }
}

body {
    font-family: "Hiragino Kaku Gothic Pro", "メイリオ", sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #3A6073, #16222A);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
}

.user-avatar {
    width: 330px;
    height: 330px;
}

.secondary-btn img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}