html {
  min-height: 100%;
}

body {
    background-image: url('/images/momentum_wave_1920x1080.jpg');   
    background-size: cover;
    background-position: top;    
    background-repeat: no-repeat;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 90vh;
    text-align: center;
}

#main_container {
    color: #ffffff;
    height: 70vh;
}

.text-shadow {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}