:root
{
    --primary-blue: #00a8ff; 
    --dark-blue: #37d1e9;
    --text-color: #ffffff;
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body, html
{
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: var(--font-main);
    /* overflow: hidden; */
    background-image: url('https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiirpw28sjEOUJUZ2H3Qi8QcnxstKeqxJP1Kf_mzCIULGVbwI7lZfS84rXUZTOAvBndOPwBdb9-RL3_pLn3Gc0HhW6_ypHqwdvWLzguTOhxEWu1y9XArOxNyRXtHbP49i0fjnUqbvOZ-lP_BZSQVezPMQTlyVs80y4_FhytTw7n4EMvnWDz6QyEmzfH8uE/s1600/BG_CS_PR_00.jpg'); 
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    overflow-y: auto;
}
/* Tùy chỉnh thanh cuộn trang */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: rgba(0,0,0,0.2); }
::-webkit-scrollbar-thumb {
    background: #3eabe9;
    border-radius: 4px;
}