html {
    min-height: 100%;
     background-image: linear-gradient(90deg,#00121b 38%,#a70094);
} 

.section-top
{
    background-image: linear-gradient(90deg,#00121b 38%,#a70094);
    height: 100vh;
}
 /* navi */
 .navi
 {
    width: 100%;
    height: 50px;
    padding: 5px 100px;
    line-height: 40px;
    display: flex;
    justify-content: space-between;
    position: fixed;
    background: #222;
 }
 @media (max-width: 767px){
    .navi 
    {
        padding: 5px 20px;
    }
 }
 .navi ul
 {
    display: flex;
    justify-content: space-between;
 }
 .navi ul li a
 {
    padding: 30px;
    color: white;
 }
 .navi li
 {
    list-style: none;
 }
 #logo
 {
    font-family: sans-serif;
    font-weight: bold;
    font-size: 50px;
    background-color: black;
    color: yellow;
    width: 50px;
 }
 .navi span #logoM
 {
    letter-spacing: -0.25em;
    font-style: italic;
 }
 .navi span #logoO
 {
    letter-spacing: -0.4em;
 }
  #logo-text
 {
    font-size: 40%;
    color: white;
    margin-left: 15px;
 }

 /* 2 boxen */
 .left
 {
    
    flex: 0 0 45%;
    max-width: 45%;
    background: var(--bg-black-100);
    box-shadow: 0 0 20px rgba(255,255,255,0.2);
    padding: 20px;
}
.left:hover
{
    box-shadow: 0 0 20px rgba(255,255,255,0.3);
    
 }
 .left a
 {
    font-size: 20px;
 }
 .right a
 {
    font-size: 20px;
 }
.right:hover
{
    box-shadow: 0 0 20px rgba(255,255,255,0.3);
}
 .right
 {
    flex: 0 0 45%;
    max-width: 45%;
    background: var(--bg-black-100);
    text-align: left;
    box-shadow: 0 0 20px rgba(255,255,255,0.2);
    padding: 10px 20px;
 }
 .box-flex
 {
    display: flex;
    justify-content: space-between;
    margin-top: 50px;
    flex-wrap: wrap;
 }
 @media (max-width: 768px){
    .box-flex
    {
        flex-direction: column;
    }
    .col-6{
        flex: 0 0 100%;
        max-width: 100%;
    }
 }