Style.css

/* =========== GOOGLE FONTS =========== */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

:root{
    --navbar-color: #707070;
    --main-color: #1C1C1C;
    --links-color-mobile: #fff;
}

body.dark-theme{
    --navbar-color: #fff;
    --main-color: #fff;
    --links-color-mobile: #1c1c1c;
    
}

*{
    padding: 0;
    margin: 0;
    text-decoration: none;
    list-style: none;
    box-sizing: border-box;
}

body{
    font-family: 'Poppins';
    background-color: var(--links-color-mobile);
}

.bd-container{
    /* max-width: 968px; */
    width: calc(100% - 3rem);
    margin-left: 1.5rem;
    margin-right: 1.5rem;
}


.l-header{
    width: 100%;
    position: fixed;
    top: 0;
    left: 0; 
    z-index: 100;
}

/* ========= NAVBAR Section========= */



nav{
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media screen and (min-width: 768px){
    body{
      margin: 0;
    }
  
    .section{
      padding-top: 7rem;
    }

    .l-header{
        display: flex;
        align-items: center;
        justify-content: center;
    }
  
    .nav{
      width: 1000px;
      height: calc(3rem + 1.5rem);
    }

    .nav__menu{
        display: flex;
    }

    .nav__logo{
        color: var(--navbar-color);
        font-weight: 600;
    }
  
    .nav__list{
      display: flex;
      align-items: center;
    }

    .nav__item{
      margin-left: 3rem;
      margin-bottom: 0;
    }

    .nav__link{
        color: var(--navbar-color);
        font-weight: 600;
    }
  
    .nav__toggle{
      display: none;
    }

    .__dark-mode{
        margin-left: 2rem;
        cursor: pointer;
    }

    .bx-sun{
        color: var(--main-color);
    }
  
}

@media screen and (max-width: 768px) {

    .nav{
        z-index: 100;
        margin-top: 1.3em;
    }

    .nav__menu{
        position: fixed;
        top: -100vh;
        right: 0;
        left: 0;
        height: 40vh;
        width: 90%;
        margin: 0 auto;
        padding: 2.5rem 0 0;
        text-align: center;
        background-color: var(--main-color);
        transition: .4s;
        box-shadow: 0 0 4px rgba(0,0,0,.1);
        border-radius:1rem;
        z-index: 100;
    }

    .nav__item{
        margin-bottom: 1rem;
    }

    .nav__menu ul li a{
        color: var(--links-color-mobile);
    }

    .nav__link, .nav__logo, .nav__toggle{
        color: var(--main-color);
        font-weight: 600;
    }

    .nav__link{
        transition: .3s;
    }

    .nav__toggle{
        display: block;
        font-size: 1.3rem;
        cursor: pointer;
        color: var(--main-color);
    }

    .__dark-mode{
        color: var(--links-color-mobile);
        cursor: pointer;
    }

    /* show-menu  */

    .show-menu{
        top: calc(3rem + 1rem);
    }


}

/* =========== SECTION part ============  */

.container{
    position: absolute;
    top: 80px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.content{
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 70%;
    margin-top: 50px;
    margin-bottom: 30px;
}


.text h1{
    color: var(--main-color);
    font-family: Poppins;
    font-size: 50px;
    line-height: 50px;
    margin-bottom: 10px;
}

span{
    color: #26C1F6;
}

.text p{
        color: #787878;
        font-weight: 600;
        margin-bottom: 10px;
}

input{
    background-color: #F5F5F5;
    padding: 15px;
    border-radius: 10px;
    outline: none;
    border: none;
    margin-bottom: 10px;
}

input::placeholder{
    font-size: 15px;
    font-family: poppins;
}

button{
    padding: 12px;
    border-radius: 10px;
    border: none;
    background: #000000;
    font-family: Poppins;
    color: #fff;
    font-size: 15px;
    margin-left: -20px;
    margin-top: 4px;
}

.person .__BG img{
    width: 320px;
}

.person .__BG{
    border-radius: 250px 0px 250px 250px;
    padding-left: 70px;
    width: 390px;
    height: 420px;
    background-color: #D9F5FF;
    overflow: hidden;
}

@media screen and (min-width:750px) and (max-width: 1000px) {
    .text h1{
        font-family: Poppins;
        font-size: 40px;
        line-height: 40px;
    }

    p{
        font-size: 14px;
    }

    .person .__BG{
        width: 290px;
        height: 320px
    }

    .person .__BG img{
        width: 220px;
    }

    input{
        background-color: #F5F5F5;
        padding: 10px;
        border-radius: 10px;
        outline: none;
        border: none;
        margin-bottom: 10px;
    }

    input::placeholder{
        font-size: 12px;
        font-family: poppins;
    }
    
    button{
        padding: 7px;
        border-radius: 10px;
        border: none;
        background: #1C1C1C;
        font-family: Poppins;
        color: #fff;
        font-size: 12px;
        margin-left: -20px;
        margin-top: 4px;
    }
}


@media screen and  (min-width:250px) and (max-width:750px) {
    .content{
        flex-direction: column;
    }

    .person{
        margin-top: 20px;
    }
    .person .__BG{
        width: 290px;
        height: 320px
    }

    .person .__BG img{
        width: 220px;
    }




}