temp.css

@media (max-width: 500px) {
    .header {
        text-align: center;
        font-size: 1.5rem;
    }
}

html {
    background: rgb(0, 0, 0);
}

.container {
    width: 100%;
    height: 150vh;
    border: 3px solid red;
    justify-content: center;
    display: flex;
    align-items: center;
    flex-direction: column;
    flex-wrap: wrap;
}

.box1 {
    height: 120px;
    width: 320px;
    border: 2px solid rgb(255, 255, 255);
    margin: 13px;
    text-align: center;
    background: #ff000091;
    border-radius: 3px;
    color: white;

}

.header {
    font-size: 3rem;
    font-weight: bold;
    color: rgb(255, 255, 255);

}

.par {
    text-align: center;
}

input {
    height: 1.3rem;
    border-radius: .2rem;
    border: 1px solid rgb(255, 255, 255);
}

input:focus {
    border: 2px solid rgb(255, 255, 255);
}

.header:hover {
    color: blue;
    font-family: Georgia, 'Times New Roman', Times, serif;
}