_header.css

body{
    /* background-color: black; */
    margin: 0;
    padding: 0;
    color: #ffffff;
}

#header{
    background: url(./assets/img/cards/header01.png) center/cover fixed;
    /* background-repeat: repeat-x; */
    height:100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    margin: 0;
    padding: 0;
    /* background: linear-gradient(#262626,#262626,#f2440577) fixed; */
    padding-top: 30px;
}

#header nav{
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    width: 90%;
    height: 5em;
    margin-left: 10em;
    align-self: center;
    margin: 0;
}

#header nav ul{
    display: flex;
    justify-content: space-between;
    color: #ffffff;
    width: 45em;
}

#header nav ul li{
    list-style: none;
}
#header nav ul li a{ 
    text-decoration: none;
    color: #ffffff;
    font-family: sans-serif;
    font-weight: bold;
}
.desc{
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    flex-basis: 30em;
    width: 100%;
    height: 100%;
    align-items: center;
    /* align-self: center; */
    margin: 0;
    /* margin-top: 5em; */
}

.cols-desc{
    flex-basis: 40%;
    width: 100%;
    height: 100%;
    text-align: justify;
}

.header-text{
    display: flex;
    flex-direction: column;
    margin-top: 3em;
    /* justify-content: center; */
    align-items: flex-start;
    /* align-content: center; */
}

.anim{
    /* flex-basis: 40%; */
    text-align: center;
    width: 100%;
    align-items: center;
}

.cols-desc img{
    width: 100%;
      
    /* height: 31em; */
    /* margin-top: 7em; */
}

.cols-desc h1{
    font-size: 55px;
    margin-top: 1.7em;
} 
.cols-desc h1 span{
    color: #f24405;
}

.cols-desc p{
    text-align: justify;
    font-size: 18px;
}

.cols-desc p span{
    color: #f24405;
    font-size: 40px;
    line-height: .6em;
    opacity: 0.8;
}

.start{
    margin-top: 4.5em;
    padding: 7px 25px;
    display: inline-block;
    /* border: 1px solid; */
    background: linear-gradient(31deg,#592202,#f24405);
    border-radius: 6px;
    font-weight: bold;
    color: #fff;
    font-family: sans-serif;
    transition: .3s;
}

.start:hover{
    /* border: 1px solid gold; */
    color: #fff;
    transition: .3s;
    transform: scale(1.03);
    -webkit-transform: scale(1.03);
    -moz-transform: scale(1.03);
    -ms-transform: scale(1.03);
    -o-transform: scale(1.03);
    -webkit-transition: .3s;
    -moz-transition: .3s;
    -ms-transition: .3s;
    -o-transition: .3s;
    animation:bord3 1s forwards linear;
    -webkit-animation: bord3 1s forwards linear;
}

@keyframes bord3 {
    0%{
        border-left: 1px solid gold;
      }
      25%{
        border-top: 1px solid gold;
      }
      50%{
        border-right: 1px solid gold;
      }
      100%{
        /* border-bottom: 1px solid gold; */
        border-right: 1px solid gold;
        border-left: 1px solid gold;
        border-top: 1px solid gold;
      }
}