* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 300px;
    height: 600px;
    position: relative;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.btn {
    padding: 10px 20px;
    background-color: #f00;
    color: #fff;
    border: none;
    border-radius: 5px;
    text-transform: uppercase;
    text-decoration: none;
    transition: transform 0.3s;
    animation: pulse 1s infinite;
}

.btn:hover {
    transform: scale(1.1);
}

.text {
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 0, 0, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(255, 0, 0, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(255, 0, 0, 0);
    }
}